Solve system of equations.
-3 x-y=4
4 x+2 y=-8

Answers

Answer 1

The solution of the given system of equations is (0, -4)

We will use the substitution method.

Given the system of equations:

-3x - y = 4   ............ (1)

4x + 2y = -8   ..........(2)

Add 3x to both sides of (1):

-3x - y +3x = 4 + 3x

-y = 4+3x

Multiply by (-1)

y = -(4+3x)

Substitute y = -(4+3x) into equation (2)

4x + 2y = -8

4x + 2. (-(4+3x)) = -8

4x - 8 - 6x = -8

-2x -8 = -8  (Add 8 to both sides)

-2x -8 + 8 = -8 + 8

-2x = 0

x = 0

Substitute x = 0 into:

y = -(4+3x)

y = -(4+3 . 0) = -4

The solution is (0, -4)

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Related Questions

David has 11 shirts to fold. Let N be the number of shirts he would have left to fold after folding F of them. Write an equation relating and 2F. Then grab your equation using the axes below

Answers

The linear equation from the given statement is the N + F+11 = 2F.

According to the statement

We have to write the linear equation.

So, For this purpose, we know that the

The definition of a linear equation is an algebraic equation in which each term has an exponent of one and the graphing of the equation results in a straight line.

From the given information:

David has 11 shirts to fold. Let N be the number of shirts he would have left to fold after folding F of them. Write an equation relating and 2F.

Then

The number of shirts left = N

The number of the shirts which are folded = F+11

The total number of shirts = 2F

And then

The linear equation becomes :

N + F+11 = 2F

This the linear equation for the given statement.

So, The linear equation from the given statement is the N + F+11 = 2F.

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3/5(1/2p + 2r) + 2p

please simplify!!!

Answers

The simplified form of the algebraic expression is [tex]\frac{23}{10} p+\frac{6}{5} r[/tex] .

An expression constructed using integer constants, variables, and algebraic operations is known as an algebraic expression in mathematics (addition, subtraction, multiplication, division and exponentiation by an exponent that is a rational number).

A good example of an algebraic expression is 3x² + 2xy + c.Any expression that can be converted into a rational fraction using the properties of the arithmetic operations is said to be rational (commutative properties and associative properties of addition and multiplication, distributive property and rules for the operations on the fractions). In other terms, a rational expression is one that can be created using only the four arithmetic operations and the variables and constants.

Given expression is of the form:

[tex]\frac{3}{5} (\frac{1}{2}p+2r )+2p[/tex]

Now we will use the distributive property to expand the algebraic expression:

[tex]or, (\frac{3}{5} \times\frac{1}{2}p+\frac{3}{5} \times2r) +2p\\\\or,\frac{3}{10}p+\frac{6}{5} r+2p\\ \\or,\frac{3+20}{10} p+\frac{6}{5} r\\\\or,\frac{23}{10} p+\frac{6}{5} r[/tex]

Hence the simplified algebraic expression is  [tex]\frac{23}{10} p+\frac{6}{5} r[/tex] .

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If angle 5 is 120 degrees, find the value of <8

Answers

Answer:Answer:

The measurement of the angle is 60

Step-by-step explanation:

The two blue lines are straight and parallel lines. The sum of the angles on a straight line is 180 degrees. Angle 5 and angle 6 are on a straight line. Therefore

Angle 5 + angle 6 = 180

If angle 5 is 120 degrees, then

Angle 6 = 180 - 120 = 60 degrees.

Sole this algebraic expression shown in the picture below:

Answers

The value of x from the expression given is - 5

What are algebraic expressions?

Algebraic expressions are expressions composed of variables, terms, factors, coefficients and constants.

They are also made up of mathematical operations such as addition, subtraction, division, multiplication, etc.

Given the expression, let's find the value of x

3(x + 1) = 2(x - 1)

Expand the bracket

3x + 3 = 2x - 2

collect like terms

3x - 2x = -2 - 3

Subtract like terms

x = - 5

Thus, the value of x from the expression given is - 5

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HELP ME SOLVE PLEASEEEE

Answers

Answer: It is m<U = 60 and m<V = 120 (x = 20)

Step-by-step explanation:

1. We know that these 2 angles are supplementary, which means both adds up to 180 degrees.

2. So first, we do this:
             3x + 2(m<U) = 180
          2a. We do this to find m<U

3. We can also notice that 3x is m<U, so substituting m<U with 3x makes sense. 3x + 2(3x) = 180

4. We then simplify:
3x + 6x = 180
9x = 180

5. We will then divide:
x = 20

6. With the new found info, we substitute x with 20:
m<U = 3(20)
m<V = 2(3(20))

7. Doing the math, it becomes:
m<U = 60
m<V = 120

(i) You can add both up if you want to make sure, but it is correct

m = 0.15 (8.6 - s)
The amount in moles, m, of a reactant s seconds after the start of a chemical reaction is given by
the equation above. Which of the following is the best interpretation of the number 8.6 ?

Answers

The best interpretation of the number 8.6 according to the task content is; The completion time of the reaction.

What is the best interpretation of the number 8.6?

It follows from the task content that the number 8.6 as given in the task content can be agreed to be the completion time of the reaction.

This follows from the fact that, at time, s = 8.6, amount in moles, m of the reactants remaining becomes, 0 in which case, the reaction is complete.

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5. Which equation in point-slope form contains the points (6, 2) and (2, 4)?
O,
O
O
O
y-2=-2(x-6)
y-4=--(x-6)
y-4--2(x-2)
y-2---(x-6)

Answers

The answer is: y-2= -1/2(x-6)

Step- by - step

( 6,2) and (2,4)

m= y2-y1/x2-x1

m=4-(2)/2-(6)

m=2/-4

m= - 1/2

y-y1=m(x-x1)

y-2= - 1/2 (x-6)

y-2= - x/2 + 3

y= - x/5 + 5

Reorder terms

y= - 1/2 ( x+5 )

Remove parentheses

y= - 1/2x+5

Point- slope form

y-2= - 1/2 (x-6)

What is the equation of the line that passes through the point (−4,5) and has a slope of 0?

Answers

Answer:

y = 5

Step-by-step explanation:

A line with a slope of 0 is a horizontal line parallel to the x- axis with equation

y = c ( c is the value of the y- coordinates the line passes through )

the line passes through (- 4, 5 ) with y- coordinate 5 , then

y = 5 ← equation of line

What ordered pair is a solution of the equation y = 4x?
A. (1, 3)
B. (-1, -4)
C. (-4, -1)
D. (1, -4)

Answers

D. i think. Maybe.find out

Use grids to find all the factor pairs for each number

Answers

All the factor pairs are given using the grids:

17 × 1 = 176 × 4 = 426 × 22 = 13237 × 1 = 3729 × 1 = 298 × 6 = 48

What are factor pairs?A factor pair is defined in mathematics as a set of two factors that, when multiplied together, yield a specific product.In other words, we multiply a pair of numbers to get a product. In the multiplication statement, for example, 6 7 = 42, 6 and 7 are one of the factor pairs that give us the product 42.

So,

17 × 1 = 176 × 4 = 426 × 22 = 13237 × 1 = 3729 × 1 = 298 × 6 = 48

(Refer to the grids given below)

Therefore, all the factor pairs are given using the grids:

17 × 1 = 176 × 4 = 426 × 22 = 13237 × 1 = 3729 × 1 = 298 × 6 = 48

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which expression is equivalent to squareroot 4j^4/9k^8

Answers

Answer:

It's the third choice:

2/3 j^2/k^4

Step-by-step explanation:

√ [4j^4/9k^8)]

= √(4j^4) / √9k^8

= 2j^2 / 3k^4

= 2/3 j^2/k^4

(-7/2z+4)Z+(1/5z-15)

Answers

Answer:

I D K if this even helps at all T B H

A number 1-10 is selected at random. What is the probability of selecting an odd or a number greater than 8?

Answers

Answer:

0.6

Step-by-step explanation:

Answer: 20%

Step-by-step explanation: If you look at it like 100 then think of 20% of 100.

20% or 2.

A rocket flies 10 km vertically, then 20 km at an angle of 15° to the vertical and finally 60 km at an angle of 26° to the vertical. Calculate the vertical height of the rocket at the end of the third stage.​

Answers

The vertical height of the rocket at the end of the third stage is 83.2 km.

We are provided that the rocket travels first 10 km vertically up (OA), then the rocket travels for 20 km (AC) at an angle of  15° from point A.

Let rocket travels 'a' distance vertically up(AB) during this,

then, rocket travels for travels for 60 km (CD) at an angle of  26° from point C.

Let rocket travels ' b' distance vertically up (BX) during this.

So,

Total Vertical Height Covered = 10 + a + b

So, According to diagram

In ΔABC

[tex]cos \ 15[/tex]° [tex]= \frac{a}{20}[/tex]

[tex]\\a = 20 * cos 15[/tex]° = 19.32km

In ΔCDE

[tex]cos \ 26[/tex]° [tex]= \frac{b}{60}[/tex]

[tex]\\b = 60 * cos 26[/tex]° = 53.9km

Since,

Total Distance = 10 + a +b

Total Distance = 10 + 19.32 + 53.9

Total Distance = 83.2 km

Therefore, Vertical height of the rocket at the end of third stage =  83.2 km

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Carmen is making a strawberry drink. The recipe calls for 5 parts strawberry juice to 3 parts water. Carmen would like to make 64 fluid ounces of the strawberry drink. How many fluid ounces of strawberry juice and water does Carmen need?

----Carmen will need
__ fluid ounces of strawberry juice and
__ fluid ounces of water to make 64 fluid ounces of strawberry drink.

Answers

Answer:960

Step-by-step explanation:


A common tangent is the point at which a line in the same plane as a circle intersects the circle.

Answers

Answer:

the angle made by that line is tangent

A bag contains 3 red marbles, 5 blue marbles and 4 green marbles. If
two marbles are drawn out of the bag, what is the exact probability
that both marbles drawn will be red?
+-
Answer:
Submit Answer

Answers

the probability of drawing 2 red marbles from the bag will be 0.0455.

Number of Red marbles = 3

Number of blue marbles = 5

Number of green marbles = 4

Total marbles = 3 + 5 + 4 = 12

Probability of drawing 2 red marbles from the bag will be:

P = 3 / 12 × 2 / 11

P = 6 / 132

P = 3 / 66

P = 1 / 22

P = 0.0455

Therefore, the probability of drawing 2 red marbles from the bag will be 0.0455.

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Given: triangle ABC,
Angle B=120°,
AB= 6, BC = 10
Find: The area of triangle ABC

Answers

The area of triangle ABC when Angle B=120°, AB= 6, BC = 10 is 25.980 square unit.

As per the question statement, we are supposed to find out the area of triangle ABC in which angle B=120°, AB= 6, BC = 10.

Lets find out AC for which we should know about Cosine formula

i.e., [tex]AC^{2} =AB^{2} +BC^{2} -2(AB)(BC)cos(B)\\AC^{2} =6^{2} +10^{2} -2*6*10cos120\\AC^{2}= 36+100-120*(-0.5)\\AC^{2}=196\\AC=\sqrt{196} =14[/tex]

Hence We have measures of all three sides of the triangle ABC.

Now we use the Heron's formula for calculating the area of triangle ABC.

We need semi perimeter i.e., [tex]s=\frac{AB+BC+AC}{2}[/tex]

[tex]s=\frac{30}{2} =15[/tex]

Now Area is given by,

[tex]area=\sqrt{s(s-AB)(s-BC)(s-AC)} \\area=\sqrt{15(15-6)(15-10)(15-14)} \\area=\sqrt{15*9*5*1} \\area=\sqrt{675} \\area = 25.980 unit^{2}[/tex]

Area: The space occupied by an object or a shape in square units.Cosine Formula: Uses the cosine of an angle to determine the remaining sides of the triangle.Heron's Formula: Uses the measure of the all sides of triangle to calculate the area of the triangle.

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which number produces an irrational number when multiplied by 1/3?
A. 0.166
B. 2
C. 2/3
D. square root of -17
I think its B

Answers

Answer:

Step-by-step explanation:

Your answer is D because the number is irrational to start, and therefore will be irrational if divided by a rational number.

write 1001 in binary form​

Answers

Answer:

1111101001

Step-by-step explanation:

Binary 1001 = 9. « Previous (1000) Next (1010) ».

Perform the indicated operation.
-10 + 15
a) -25
b) 25
c) -5
d) 5

Answers

Answer: d)

-10 + 15 = 5

Answer:

D. 5

Step-by-step explanation:

-10 + 15 Can be rewritten as 15-10

15-10=5

The answer is 5.

Hope this helps!

Please mark as brainliest if correct!

How can I solve 2z+–
4z–2z–2

Answers

Answer:

Step-by-step explanation:

=-4z-2

Pls solve part e for me thanks

Answers

Using it's concept, the probability of at least 1 red face upper most is 17/18 = 0.9444 = 94.44%.

What is a probability?

A probability is given by the number of desired outcomes divided by the number of total outcomes.

For each cube, the probability of no red faces is:

Cube A: 1/6.Cube B: 3/6 = 1/2.Cube C: 4/6 = 2/3.

Hence the probability of no red faces in anu cube is:

1/6 x 1/2 x 2/3 = 1/18.

Which means that the probability of at least 1 red face is given by:

1 - 1/18 = 17/18 = 0.9444 = 94.44%.

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1/2-3/4 con su procedimiento por favor​

Answers

Answer:

-0.25

Step-by-step explanation:

1). When beginning, you need to find the least common multiple (lcm), which would be 2.

2). Divide 3 by 2 leaving you with 1.5.

3). Then divide 1.5 by 2 leaving you with -1/4.

4). Convert -1/4 into a decimal.

5). Final answer -0.25.

Answer: -0.25

Step-by-step explanation:

[tex]\displaystyle\\\frac{1}{2}-\frac{3}{4}=\\\\ \frac{1*2}{2*2} -\frac{3}{4} =\\\\\frac{2}{4} -\frac{3}{4}=\\\\ \frac{2-3}{4} =\\\\\frac{-1}{4} =\\\\-\frac{1}{4} =\\\\-0.25[/tex]

To the nearest mile, what is the total distance that he ran?
6 miles
8 miles
11 miles
25 miles

Answers

I would like to help but since there is no picture I don’t have lots of information for you

But to find your answer first you have to divide guipur running time by your pace. Example : If your pace is 8 minutes per mile and you ran for 32 minutes: 32 min divided by 8 per mi = 4 miles

Khloe bought snacks for her team's practice. She bought a bag of chips for $2.69 and a 15-pack of juice bottles. The total cost before tax was $39.14. How much was each bottle of juice

Answers

39.14-2.69=36.45 36.45/15=2.43
Each bottle of juice is 2.43

Round to the nearest cent 6 divided by 2.29

Answers

Answer: $0.38

Step-by-step explanation:

2.29/8=

0.38167=

0.38167=$0.38

write the slope-intercept form of the equation of the line through the given point with the given slope.
through: (-2,-5) and slope= -3

Answers

y = -3x - 11

calculator

A family pass to the amusement park costs $54. Using the Distributive Property, write an cost in dollars of 8 family passes.

Answers

$6.75 is going to be your answer

A group of friends watched a comedy movie marathon starring a group of comedians. The graph below shows the number of movies watched and the number of hours of sleep the friends had slept between Saturday and Sunday. Each dot represents one of the friends.
First Options:
Increased
Decreased
remained the same

Second Options:
A positive
A negative
No

Third Options:
Numbers of hours of sleep
Genre of the movies
Actors in the movies

Answers

There is no relationship between the number of movies and the number of sleep hours.

What is a relationship?

It is always a thing of importance to show data by the use of a scatter plot. The scatter plot must always have two axes. The vertical (y axis ) and the horizontal (x axis). It is always common to plot the independent variable on the x axis and the dependent variable on the y axis.

The scatter plot thus represented shows how one variable is related to another. In this case, we are trying to obtain how the number of sleep  hours tend to be related with the number of movies and this has been shown on the scatter plot that is shown in the question above.

It is clear from the statements in the question that the line of best fit would show that as the number of movies remained constant, the number of sleep hours decreased. This now implies that there is no relationship between the number of movies and the number of sleep hours.

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