Find the solution of the system of equations -7x-3y=-20 3x+6y=-15
Answers
9514 1404 393
Answer:
(5, -5)
Step-by-step explanation:
I like a graphing calculator for quickly finding a solution to a system of equations. It shows the solution to be (5, -5).
__
We can add the second equation to 2 times the first to eliminate the y-variable.
2(-7x -3y) +(3x +6y) = 2(-20) +(-15)
-11x = -55 . . . . . collect terms
x = 5 . . . . . . . . . divide by -11
Substituting this value into the second equation, we have ...
3(5) +6y = -15
6y = -30 . . . . . . . . subtract 15
y = -5 . . . . . . . . . . divide by 6
The solution is (x, y) = (5, -5).
Related Questions
brainly and 50 points if you answer right because this is my writing prompt from my math class.
Take a look at the Ccenario given your friend needs help. so how would you explain what to do? what are some possible mistakes your friend might make? remember to explain in complete sentances.
fatima paid for 5 pallets of grass to be deliverd.
each pallet of grass cost $129.95.
fatima paid $76.20 for delivery.
what is the total amount fatima paid?
pls help
Answers
Answer:
$725.95Step-by-step explanation:
Given
Cost of each pallet = $129.95Number of pallets = 5Delivery cost = $76.20Total cost is:
5*$129.95 + $76.20 = $725.95please help immediately this is 2 days late
Answers
Answer:
51
Step-by-step explanation:
The graph shows the temperature y in a freezer x minutes after it was turned on. Five minutes after
being turned on, the temperature was actually four degrees from what the trend line shows. What
values could the actual temperature be after the freezer was on for five minutes?
Click the icon to view the graph of the freezer temperature versus time.
Select all that apply.
DA. 0°F.
OB. 32°F
C. 25°F
OD. 18°F
E. 21°F
OF. 29°F
Click to select your answer(s).
Question 7
of 8
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Answers
Answer:29
Step-by-step explanation:
у = 2х - 1
2х + Зу = -7
Answers
Answer: 1. у %3 2х
Step-by-step explanation: Find the distance between (0, 0) and (-3, 4) pair of points
652 students attend Tippett Middle School. 49% live less than three miles from school. About how many students is this? Round your answer to the nearest WHOLE NUMBER.
Answers
Answer: 319 students
Step-by-step explanation:
There are 652 kids and 49% of them live less than three miles from school.
In a whole number this will be:
= 49% * 652
= 49/100 * 652
= 319.48
= 319 students
The price of a pair of shoes increases from $67 to $83. What is the percent 1 point
increase to the nearest percent? *
Answers
Answer:
16
Step-by-step explanation:
What is the slope of the line shown below?
Answers
Answer:
D
Step-by-step explanation:
Slope formula: m = (y2 - y1) / (x2 - x1)
First coordinate: (1, 3)
Second coordinate: (3, 9)
m = (9 - 3) / (3 - 1)
m = (6) / (2)
m = 3
7 is 1/10 of
pls help and thank you :)
Answers
7 is 1/10 of 70. You can figure this out by multiplying 7 by 10
What is CD equaled to ?
Answers
Answer:
10
Step-by-step explanation:
cd being the longer segment is equal to 2/3s of 15.
Answer:
C D equals 6 So your answer is =6
Step-by-step explanation:
35
53"
X
Find the value of x. Round your answer to the nearest tenth.
Answers
Answer:
x = 26.4
Step-by-step explanation:
Here, we want to get the value of x
To get this, we are to use the appropriate trigonometric ratio
From the question, we have the opposite and the adjacent
The trigonometric ratio to use in this case is the tangent
Mathematically;
Tan 53 = 35/x
x = 35/tan 53
x = 26.37
which is 26.4
What is the temperature, in degrees Fahrenheit, shown on the thermometer above to the nearest integer?
Respond in the space provided.
Answers
Answer: 21
Step-by-step explanation:
Formula
(21.2°F − 32) × 5/9 = -6°C
A cube with a volume of 64 cubic meters is scaled by a factor of 5. What is the volume of the modified cube in cubic meters? (Note: do not include the units in your answer.)
Answers
Answer:
8000 for plato users
Step-by-step explanation:
Answer:
8000
Step-by-step explanation:
Daysi buys a video game on sale. If the video usually costs $30.00, and it
was on sale for 25% off, how much did Daysi pay?
Answers
Answer:
$22.5
Step-by-step explanation:
The original price is $30 and it's on sale for 25% off. Since 25% is a quarter of the total price, I divided 30÷4=7.5. $7.5 is 25% of $30, so 7.5 is the amount taken off the original price. To find what Daysi paid, I subtracted 30-7.5=22.5. $22.5 is the result after the 25% off, so Daysi paid $22.5.
A triangle has side lengths of 21 cm and 17 cm. What is the range of values possible for the 3rd side?
Answers
Answer:
[tex]4 < x < 38[/tex]
Step-by-step explanation:
[tex]21 - 17 = 4[/tex]
[tex]21 + 17 = 38[/tex]
The range of 3rd side is in between 4 to 38.
[tex]4 < side 3 < 38[/tex]
A triangle has side lengths of 21 cm and 17 cm
side 1 = 21 cm
side 2 = 17 cm
What is the relation between side of triangle?
The sum of the lengths of any two sides of a triangle must be greater than the length of the third side.
Therefore,
length of side 3
[tex]21-17 < side 3 < 21+17[/tex]
[tex]4 < side 3 < 38[/tex]
Therefore the range of 3rd side is in between 4 to 38.
[tex]4 < side 3 < 38[/tex]
To learn more about the side of triangle visit:
https://brainly.com/question/20734777
somebody please help me in this question, I’ll give you brainlyest and giving you 20 points :)
Answers
Answer:
Step-by-step explanation:
Noice....
6(2y+6)=4(9+3y)
divide both sides by 2
6(2y+6) / 2 = 4(9+3y) / 2
then after simplification
3(2y+6) = 2(9+3y)
6y + 18 = 18 + 6y
w t hell
it cant be solved
it can be but i think its misprinted
Help :(((((((((;;;;; I NEED HELP W MATH
Answers
Answer:
p = 6
Step-by-step explanation:
p/15 = 4/10
*cross multiply*
p*10 = 15*4
10p=60
*divide to get p alone*
p=6
Find the
common factors of 5x²y and - 3x
Answers
what is the difference between associative property,communitive property,and distributive property? (will mark brainliest)
Answers
Answer:
Commutative switches the numbers, while associative keeps the numbers positions but changes the parentheses. I hope that helped
The communities property changes the order only. Example- 3+2 -> 2+3
The distributive property distributes the number from the outside of the parenthesis to the numbers inside
Example- 4(5+3) so you distribute the 4 to the 5 and 3 by multiplying. The answer would be 20+12
I hope this helps :))
What is the solution to the equation −4(2y − 4) − 4y = 4? (put number answer only)
Answers
-12y + 16 = 4
-12y = -16
Y = 1.3333333
Answer:
y=1
Step-by-step explanation:
Let's solve your equation step by step.
Step 1: Simplify both sides of the equation.
−4(2y−4)−4y=4
(−4)(2y)+(−4)(−4)+−4y=4(Distribute)
−8y+16+−4y=4
(−8y+−4y)+(16)=4(Combine Like Terms)
−12y+16=4
−12y+16=4
Step 2: Subtract 16 from both sides.
−12y+16−16=4−16
−12y=−12
Step 3: Divide both sides by -12.
y=1
Write 546/61 as a mixed number.
Can you solve it
Answers
Answer:
8 58/61.
Step-by-step explanation:
546/61 = 8 remainder 58
so it's 8 58/61.
help me asap ill give brainliest
Answers
Answer:
-6, -2, 1, 8
Step-by-step explanation:
Answer:
-6, -2, 1, 8
Step-by-step explanation:
Negatives have less value than positives, so that's why the negatives go first in the answer.
estimate a 15% tip for a $60 bill
Answers
Answer:
the answer would be 15/100= .15 *60= 9 so the tip would be 9$
Answer the tax would be *.00 dollars if you estimate it
Step-by-step explanation:can I get marked brainlist
What is the reciprocal 1/5. im very confused
Answers
Answer:
5/1
Step-by-step explanation:
The reciprocal is just flipping the fraction!
Solving Systems using tables
Mikayla put $212 in a savings account at the beginning of the year. At the end of each month, she withdrew $12 from her account. Mathew put $30 in his savings account at the beginning of the year. At the end of each month, he deposited $14 in his account. Let x represent the number of months which have passed and y represent the amount in each savings account.
A. Write an equation to represent the amount in Mikayla’s savings account.
B. Write an equation to represent the amount in Matthew’s savings account.
C. Below make an input-output tables that show the amount in each account for the first 8 months
D. When will Mikayla and Matthew have the same amount in their accounts?
Mikayla Matthew
X Y X Y
0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
Answers
Answer:
i hope this helps
Step-by-step explanation:
3% is the interest rate. Using the formula I=PRT, you can simply derive the rate by putting the given numbers in.
I = 450P = 3,000R = ?T = 5 Years
The equation now goes,450 = 3,000 * R * 5450 = 15,000 * R450/15,000 = R0.03 = R
multiply it by 100,
R = 3%
The straight line L1 passes through the points with coordinates (6, 5) and (10, 3)
The straight line L2 passes through the origin and has gradient -3
The lines L1 and L2 intersect at point P
Find the coordinates of P.
Answers
Answer:
The coordinates of point p are:
x = -3.2
y = 9.6
Step-by-step explanation:
A linear relationship can be written as:
y = a*x + b
where a is the slope and b is the y-axis intercept.
For a line that passes through the points (x1, y1) and (x2, y2), the slope can be written as:
a = (y2 - y1)/(x2 - x1).
Then if we know that L1 passes through the points (6, 5) and (10, 3) the slope of this line will be:
a = (3 - 5)/(10 - 6) = -0.5
Then this line will be something like:
y = -0.5*x + b
To find the value of b we can just replace the values of one of the points in the above equation. For example if we use the point (6, 5), this means that:
x = 6
y = 5
Then we get:
5 = -0.5*6 + b
5 = -3 + b
5 + 3 = b
8 = b
Then the equation for line L1 is:
y = -0.5*x + 8
Now, for line L2 we know that it has a gradient -3 (for linear equations, the gradient is the same as the slope)
Then line L2 has a slope equal to -3
y = -3*x + b
And we know that this line passes through the origin, (0, 0)
Then if we replace the values of that point in our equation, we get:
0 = -3*0 + b
0 = b
Then line L2 is:
y = -3*x
Then our two lines are:
y = -0.5*x + 8
y = -3*x
Now we want to find the point where these lines intersect. The lines will intersect in one point that belongs to both lines, then we can use the relation:
-0.5*x + 8 = y = -3*x
-0.5*x + 8 = -3*x
now we can solve this for x.
-0.5*x + 8 = -3*x
8 = -3*x + 0.5*x
8 = -2.5*x
8/-2.5 = x = -3.2
Now we need to evaluate one of the lines on this value, i will use line L2
y = -3*(-3.2) = 9.6
Then we can conclude that the lines do intersect in the point:
x = -3.2
y = 9.6
this point is written as: (-3.2, 9.6)
Cauculate the answer when the larges prime number is 35 multiplied by the smallest prime number that is a factor of 15
Answers
Complete question :
The largest prime number that is a factor of 35 is multipled by the smallest prime number that is a factor of 15
Answer:
21
Step-by-step explanation:
Prime numbers : numbers divisible only by 1 and itself
They include ;
{2, 3, 5, 7 , 11}
Largest prime number that is a factor of 35
Factor of 35
35 = 1 * 5 * 7
Largest prime number , multiple of 35 = 7
Factors of 15
15 = 1 * 3 * 5
Smallest prime number, multiple of 15 = 3
7 * 3 = 21
Answer fasttt plsssssss
Answers
Answer:
25ax25b= 625
HELP PLS
Comparing irrational numbers with calculator
Compare.
Answers
Answer:
3 2/3 is greater
Step-by-step explanation:
3 2/3 is 3.6666 while √11 is 3.32
Please help. Picture is attached below. Thank you! :) Will give brainliest!!
Answers
Answer:
e = 2
Step-by-step explanation:
Hope this helps! ///////////////////////
7(2e - 1) - 3 = 6 + 6e =
14e - 7 - 3 = 6 + 6e =
14e - 10 = 6 + 6e
-6e -6e
8e - 10 = 6
+ 10 + 10
8e = 16
e = 2
please help me, i’m super confused one what to do since my teacher did not explain well
Find the equation of the linear function represented by the table below in
slope-intercept form.
V
5
-10
8
Answers
A linear function in slope intercept form is
y = mx + c
To find the equation, you need m and c. This can be found by substituting the points you have.
For example, 5 = -1(m) + c and -7 = 2(m) + c
From here, do simultaneous equations
c = m + 5
-7 = 2(m) + m + 5
3m = -7 -5
m = -4
c = m + 5
c = 1
Rewrite the equation: (This is your answer)
y = -4x + 1