Mathematics High School

Solve the system by substitution.
x = 9y
x-5y=20

Answers

Answer 1

Step-by-step explanation:

hope this helps you! have a great day

Solve The System By Substitution.x = 9yx-5y=20
Answer 2

The solutions of the system of equations are x = 45 and y = 5.

What is the system of equations?

One or many equations having the same number of unknowns that can be solved simultaneously called as simultaneous equation. And simultaneous equation is the system of equation.

Given:

The system of equations,

x = 9y  .... (1)

x-5y=20 ......(2)

Substituting the value of x from the equation 1 to equation 2,

we get,

9y - 5y = 20

4y = 20

y = 5

Then, x = 5(9) = 45

Therefore, the solutions of the equations are x = 45 and y = 5

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Related Questions

Can you help me plz? I'll mark brainilest

Answers

the answer is amplitude

At the craft store, Gabby bought a bag of blue and red marbles. She received 63 blue marbles and 21 red marbles. What percentage of the marbles were blue?

Write your answer using a percent sign (%).

Answers

Answer:

75%

Step-by-step explanation:

63+21 = 84

That is the overall amount of marbles, this allows you to get a percentage

63/84 = .75 = 75%

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Answers

Answer:

huh i am very confused

Step-by-step explanation:

ok got it :DHave a great day!!

The answer to a statistical question includes variability in data. Choose ALL examples of statistical questions es A) How much do the animals on the farm weigh? B) How old are all the teachers at the school? How old is the oldest teacher at the school? D How much does the black and white puppy weigh? E) How many students ate lunch in the cafeteria today?​

Answers

Answer:

A and C

Step-by-step explanation:NLE Choppa said so

Answer:

a and c

Step-by-step explanation:

hey, i would really appreciate it if someone helps me with this. It's just one multiple choice question.

Answers

Answer:

2

Step-by-step explanation:

2 is the answer!!
Hope you pass

You start at (3, 0). You move right 1 unit and left 2 units. Where do you end?​

Answers

Answer:

2,0

Step-by-step explanation:

whats the answer to this ​

Answers

Answer:

Maybe 5?

Step-by-step explanation:

If not im really sorry!!!!!!!

Select the correct
nswer.
Which of these tables represents a function?
Х
у
Х
у
х
у
Х
у
2
3
3
2
13
-3
-2
8
4
5
5
4
12
0
o
9
6
3
3
6
10
3
1
8
7
5
5
7
13
6
- 2
9
W.
x.
Y.
Z.
OA. W
OB. X
Oc. Y
OD. Z
Type here to search
BI
1

Answers

Answer:

A. W

Step-by-step explanation:

The table in which each x-value is related to exactly one y-value is the table that represents a function.

Form the tables given, in table W, every x-value (input) has exactly one y-value (output) that is related to it.

The correct table that represents a function is table W

Functions and Tables

For a table of values to be a function, the input values also known as the domain of the function must NOT have a repeated values.

All values of the domain must have a unique values in the codomain for a table of values to be a function.

From the given table, you can see that table X, Y and z all have repeated values in the domain column. This shows that these tables do not represent a function

Hence the correct table that represents a function is table W

Learn more on functions and tables here: https://brainly.com/question/3632175

The area of a triangle can be found based on the area of a _____. circle trapozoid parallelogram

Answers

Answer:

Trapezoid

Step-by-step explanation:

A triangle can be thought of as a trapezoid with one of the side length being 0.

Answer:

Parallelogram

Step-by-step explanation: "Surprisingly, this triangle (or any triangle) is related to a parallelogram." Found it in my text (Calvert Academy school)

A computer programmer worked for 5 hours and earned $25, which is a rate of $_ Per hour

Answers

Answer:

They earned 5 dollars per hour

Step-by-step explanation:

Take the amount earned and divide by the number of hours

25/5

5

They earned 5 dollars per hour

A helicopter is hovering over a landing pad 100 m from where you are standing. The angle of elevation with the ground is 12 degrees. What is the altitude of the helicopter rounded to the nearest tenth.

Answers

Answer:

Step-by-step explanation:

A helicopter is hovering over a landing pad 100 meters from where you are ... If the string is stretched straight, how high is the kite above the ground?

According to the National Weather Service, the average monthly high temperature in the Dallas/Fort Worth, Texas area from the years of 2006-2008 is given by the following table:

Month
Average Maximum Monthly Temperature
Jan
48.1
Feb
50.9
Mar
62.4
Apr
67.0
May
76.5
Jun
83.9
Jul
86.8
Aug
88.1
Sep
79.2
Oct
69.9
Nov
59.5
Dec
49.6

Plot the data on a scatter plot. Produce a sine regression model for the data. Round the values for a, b, c, and d to the nearest 0.001. Using the sine regression model predict what the temperature would be given y(30).
a.
58.4 degrees
b.
62.3 degrees
c.
76.8 degrees
d.
86.0 degrees


Please select the best answer from the choices provided

Answers

the average maximum would be C. 76.8 degrees

The sine regression model is [tex]y =20.077 \sin(0.500x- 1.959) + 67.577[/tex], and the value of y(30) is 76.8 degrees

What is a regression model?

A regression model is used to determine the association and correlation between two variables

Using a graphing calculator, the sine regression model of the dataset is:

[tex]y =20.077 \sin(0.500x- 1.959) + 67.577[/tex]

To calculate y(30), we substitute 30 for x in the equation.

So, we have:

[tex]y =20.077 \sin(0.500 * 30- 1.959) + 67.577[/tex]

Evaluate the product

[tex]y =20.077 \sin(15- 1.959) + 67.577[/tex]

Evaluate the difference

[tex]y =20.077 \sin(13.041) + 67.577[/tex]

Evaluate the sine value

[tex]y =20.077 *0.4570+ 67.577[/tex]

Evaluate the product

[tex]y =9.1752+ 67.577[/tex]

Evaluate the sum

[tex]y =76.7522[/tex]

Approximate

[tex]y \approx 76.8[/tex]

Hence, the sine regression model is [tex]y =20.077 \sin(0.500x- 1.959) + 67.577[/tex], and the value of y(30) is 76.8 degrees

Read more about regression models at:

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convert 9/8 to a decimal long division

Answers

1.125 is the decimal form
1.125 decimal form hope this helped

Find the missing angles.

Answers

Answer:

b=123

c=123

Step-by-step explanation:

Both b and c are 123

The graph of f(x)=cos(x) is transformed into a new function, g(x), by stretching it vertically by a factor of 3 and shifting it 2 units up.

What is the equation of the new function g(x)?

Enter your answer in the box
g(x)=

Answers

Answer:

I think 3cosx+2 would be g(x)

Adina has a total of $1.65 in nickels and dimes. The number of dimes is 6 more than the number of nickels. How many coins are there of each type?



Choose the correct system of equations needed to solve this problem.

A
0.10d+0.05n=60.10d+0.05n=60.10d+0.05n=6

n+d=1.65n+d=1.65n+d=1.65

B
d=n+6d=n+6d=n+6

0.05n+0.10d=1.650.05n+0.10d=1.650.05n+0.10d=1.65

C
n=d+6n=d+6n=d+6

0.10d+0.05n=1.650.10d+0.05n=1.650.10d+0.05n=1.65

D
n=d+6n=d+6n=d+6

0.05n+0.10d=1.650.05n+0.10d=1.650.05n+0.10d=1.65

Answers

Answer:

C

Step-by-step explanation:

If you divide 1.65 by 6 you'll get 0.275 so then you'll add d+6n to get d+6 and then you'll solve the question for 6n and you'll get 1.65

Find the area. Show your work.

Answers

Answer:

92 units^2

Explanation:

Assuming both sides are congruent.

Please HELP IM FALLING MATH PLEASE HELP

Answers

Answer:

D

Step-by-step explanation:

32+35=67

90-67=23

it won't let me type in the comments for some reason but i got 90 because andgle MLQ is a right angle so it is 90 degrees

The sum to infinity of a geometric series is 4 and the second term is 1. Find the first,third and fourth terms.

Answers

Answer:

2, 0.5 and 0.25.

Step-by-step explanation:

The nth term an = a1r^(n-1)  where a1 = first term and r = the common ratio.

The sum to infinity = a1/(1-r)  for  -1 < r < 1.

So we have:

Second term a2 = 1 = a1(r)(2-1) = a1r and

4 = a1/(1 - r)

From the first equation:

a1 =1/r

So substituting in the second equation:

4 = 1/ r / (1 - r)

4 = 1 / r - r^2

4r - 4r^2 = 1

4r^2 - 4r + 1 = 0

(2r - 1)(2r - 1) = 0

r = 0.5

So the first term  a1 = 1/ r =1/0.5 = 2.

The third = 1*0.5 = 0.5

and the 4th = 0.5*0.5 = 0.25.

R
56
30°
T
S
What is the measure of Angle R?
plz help

Answers

Answer:

94

Step-by-step explanation:

180-30-56=94 degrees

Which is the answer. A B C D?

Answers

The answer should be A.

Can someone explain this plss
will mark branliest.
tyyyy <3

Answers

Answer:

H and J are not true

Step-by-step explanation:

H)  12/65 ≠ 55/300

J)  11/65 ≠ 60/400

For every planet, no matter it’s period, or distance, period squared and distance cubed (equation p2d3 OR P*P/d*d*d) is the ________ NUMBER

A- differing
B-Same
C-smallest
D- Largest

Answers

I think the answer will be B

The table represents some points on the graph of a linear function.
Х
-1
5
7
11
у
6
3
2.
o
What is the rate of change of y with respect to x for this function?
2
O
2
-2

Answers

Answer:

should i provide formula

John is flying a kite at an angle of 65 degrees with the ground. If the kite's height is 70 feet
off the ground, how long is the string?

Answers

Answer:

77 feet

Step-by-step explanation:

Pls help me!!!! Im stuck!!!

Answers

Answer:

has no solution.

Step-by-step explanation:

you can see that the two equations are almost identical except for the fact that one is multiplied by 7, but it isnt completely multiplied correctly so there would be no solutions.

Answer:

infinite solutions  

Step-by-step explanation:

you can solve this by the elimination method. take the rover a equation and multiply it by -7 and then combine the equations. when you do this, you can see that either side equals 0 which means that there are infinite solutions.

-7(y= 1.5x - 6) which equals the equation below

-7y= -10.5x-42 then combine the other equation

7y=10.5x+42 and that equals

0=0

which of the following could be factored by grouping?
a. wy+wz+xy-xz
b. wy+yz-wx+yz
c. wy+wz+xy+xz
d. wx+wz-wy+wv

Answers

Answer:

wy+wz+xy+xz

Step-by-step explanation:

C.) wy+wz+xy+xz  could be factored by grouping.

What is factorization by grouping?

Method of factorization by grouping the terms:

(i) From the groups of the given expression a factor can be taken out from each group.

(ii) Factorize each group.

(iii) Now take out the factor common to group formed.

= wy + wz + xy + xz

= w(y+z) + x(y+z)

= (w+x)(y+z)

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PLEASE HELP!! LMNP is rotated 90° clockwise around the origin. What are the coordinates of M’

Answers

Answer:

The answer is "(4, -5)".

Step-by-step explanation:

Please find the complete question in the attached file.

In the given image file when we rotate it to 90 degrees clockwise so the value as the rule is [tex](x, y) \longrightarrow (y, -x)[/tex]

Putting the value in x = 5 and y = 4 then:

[tex](5, 4) \longrightarrow (4, -5)[/tex]

RU and TU are tangent to OS. Find mZR.
A. 63°
B. 54°
C. 126°
D. There is not enough information to determine

Answers

Answer:

A. 63

Step-by-step explanation:

EDGU 2020

On the main floor of the Kodak Hall at the Eastman Theater, the number of seats per row increases at a constant rate. Lucas counts 31 seats in row 3 and 37 seats in row 6. How many seats are there in row 20?


67


61


63



65

Answers

Answer:

67

Step-by-step explanation:

There are 65 seats in row 20, option D is correct.

Given that number of seats in row 3 are 31.

Number of seats in row 6 are 37

We need to find the rate of increase, we can calculate the difference in the number of seats between row 6 and row 3 and divide it by the number of rows in between:

Rate of increase = (Number of seats in row 6 - Number of seats in row 3) / (6 - 3)

Rate of increase = (37 - 31) / (6 - 3)

Rate of increase = 2

So, the number of seats increases by 2 seats per row.

To find the number of seats in row 20, we can use the rate of increase:

Number of seats in row 20 = Number of seats in row 3 + (Rate of increase × (20 - 3))

Number of seats in row 20 = 31 + (2× (20 - 3))

= 31 + (2 × 17)

= 31 + 34

= 65

Therefore, there are 65 seats in row 20.

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