Mathematics High School

Solve the system of equations by substitution.
X + y = 21
y = 6x

Answers

Answer 1

Answer:

x = 3

y = 18

Step-by-step explanation:

you replace y with 6x

x + 6x = 21

combine like terms

7x = 21

divide both sides by seven

x = 3

then you plyg 3 into the other equation

y = 6(3)

y= 18

Answer 2

Answer:

x=3

y=18

Step-by-step explanation:

x+y=21..........equation 1

or,x=21-y......equation 2

y=6x.......equation3

substituting the value of x in equation 3

y=6(21-y)

or,y=126-6y

or,7y=126

y=18

again,substituting the value of y in equation 2

x=21-y

or,x=21-18

x=3

x=3,y=18

Related Questions

-1t+14=3t+10 what value of t makes this true?​

Answers

Answer:

1 makes this problem true

Step-by-step explanation:

-1t+14=3t+10

-1(1)+14 = 3(1)+10

-1 +14 =3+10 , 13=13

So 1 makes this problem true

Please help!! Will mark brainliest

Answers

Answer:

21

Step-by-step explanation:

The missing side is 21. Hope this helps

Need help pleaseeee

Answers

Cross multiply
10(x-3) = 9x
10x - 30 = 9x
-1x = -30
X = 30

Answer:

x = 30

Step-by-step explanation:

I need help with this, i know the answer isnt 20 because the teacher told me it wasnt

Answers

Answer:

d: 68

Step-by-step explanation:

Answer:

D.68

Step-by-step explanation:

i figured it out to lol

If x = 27 and y = 70, what is y when x = 6?​

Answers

Answer: 18

Step-by-step explanation:

Is the ratio 4/10 equivalent to 10/25?

Answers

Answer:

yes if decimals aren't included

y = 2x²- 5x + 2
determine the x value for the vertex and whether this value is a maximum or a minimum
a. maximum at x = -1.25
b. maximum at x = 1.25
c. minimum at x = -1.25
d. minimum at x = 1.25

Answers

Answer: D

Explanation:

Use the vertex formula, -b/2a. Because the quadratic formula is ax^2+bx+c, -b would be 5 in this case and a would be 2 in this case. Plug the numbers in and you get 5/4. The AOS or vertex would be 5/4 or 1.25. Because the a-value is a positive in this equation, the parabola would have a minimum.  

I have a question this is the picture ​

Answers

Answer:

The answer is D

Step-by-step explanation:

If you plug them into Desmos, they'll line up

-7 - 2 ..........................................................
..

Answers

Answer:

-9 is the answer

Step-by-step explanation:

hope it helps!

Please help out :) struggling

Answers

Answer:

82

Step-by-step explanation:

evaluate means to find the numerical value of the expression

substitute x=9 and y= -2 in the expression 10-4xy

10 -4*9*(-2) = 10+( -4 )(-2)*9= 10+8*9 =82

A team has won 51 out of 68 games. whats the precent

Answers

Answer:0.75 = 75%

Step-by-step explanation:

51 divided by 68 is 0.75

Answer:

75%

Step-by-step explanation:

When you divide 51 by 68 you get .75 which is equal to 75%.

Evaluate the following:

14) 49-4( 32+116 ) 15) 72+72



16) 3278 +25

Answers

Answer:

14) -123

15) 144

16) 3303

Step-by-step explanation:

Joe can run 12 miles in 125 minutes. How many miles can he run in 230 minutes? (solve and explain the steps)

Answers

Answer:

Joe will run 22.08 miles in 230 minutes.

Step-by-step explanation:

Given that Joe can run 12 miles in 125 minutes.

so Joe running the miles in 1 minute is = 12/125 = 0.096 miles

unit rate = 0.096 miles/per minute

As Joe runs 0.096 miles in one minute.

Thus, in 230 minutes, Joe will run = 0.096 × 230 = 22.08 miles

Therefore, Joe will run 22.08 miles in 230 minutes.

There are 25 trees on the Jackson’s property. Twenty percent of the trees are oak trees. Which equation can be used to find the number of oak trees on the property?

Answers

Answer:

See below

Step-by-step explanation:

Number of oak trees

[tex] = \frac{25}{100} \times 25 \\ [/tex]

23.82600 round off to two decimal place​

Answers

Answer:

23.83......the 6 is greater than 5 so the 2 turns 3

Step-by step

a bag contains 10 red marbles, the ratio of red marbles to blue marbles is 5 to 1 find the numbers of blue marbles in the bag

Answers

Answer:

The Answer is 2 blue marbles.

Step-by-step explanation:

The numbers of blue marbles in the bag will be 2.

What is proportion ?

A proportion is an equation based on the equality of two ratios.

Here it is given that :

a bag contains = 10 red marbles

the ratio of red marbles to blue marbles is = 5:1

That is :

5 ratio of marbles is equals to = 10 marbles

now,

1 ratio of marbles is equals to = 2 marbles

Therefore, the numbers of blue marbles in the bag will be 2.

Read more about ratio at:

https://brainly.com/question/17869111

#SPJ2

A rectangular garden is 4 feet wide and 9 feet long. The dimensions of the pool are 150% larger than the dimensions of the garden.

What are the dimensions of the pool?


600 feet wide and 1350 feet long.

6 feet wide and 13.5 feet long

5.5 feet wide and 10.5 feet long

8 feet wide and 18 feet long

Answers

Answer: B) 6 feet wide and 13.5 feet long

================================================

Work Shown:

150% = 1.5 after moving the decimal 2 spots to the left

Multiply this with each of the dimensions given

4*1.5 = 6

9*1.5 = 13.5

The pool is 6 feet by 13.5 feet

Find the area of the shaded region. Use 3.14 to represent pi. Hint: You need to find height of triangle.





Question 1 options:

329.04 inches squared


164.52 inches squared


221.04 inches squared


272.52 inches squared

Answers

Answer: 221.04 inches squared

Step-by-step explanation:

If DH = (4x + 10) in. and HI = (2x − 4) in., then x =_______ , HI =_______ , and ID = _________

Answers

Answer:

x = ∞ infinite solutions or 0

HI = infinite solutions

ID = infinite solutions.

Step-by-step explanation:

Oh okay I got this now!

ID + HI = DH

ID + 2x - 4 = 4x + 10 (subtract 2x on both sides)

ID - 4 = 2x + 10 (add 4 on both sides)

ID = 2x + 14

So now ID + HI = DH

2x + 14 + 2x - 4 = 4x + 10 (simplify)

4x + 10 = 4x + 10 (subtract 10 on both sides)

4x = 4x (minus 4x on both sides)

0 = 0

I would plug in 0 as x.

Hope this helps!

Is the following a function ?

Answers

Yes it is a function

Question 18 of 25
If f) =3*+ 10 and glx) = 2x- 4, find (f+ 9)().
OA. (f+ )() = 5x +6
OB. (f+ g)() = 3*+ 2x+ 6
OC. (f+ 9)() = 3r- 2x+ 14
O D. (f+ 9)() =-3*- 2x-14
SUBN

Answers

Answer:

C. (f+ 9)() = 3r- 2x+ 14

Step-by-step explanation:

help pls pls asap i need this

Answers

Answer:

B

Step-by-step explanation:

BRAINLIEST!! Can someone help me with the following problem?


(- 2*10+2)/3 +14*2-5+9=y

Solve for "y" :)

Answers

I believe that the answer is 26 but I’m not completely sure
Have a nice day :)

Please help me with this question I’ll give brainliest for whoever is right

Answers

Answer:

5,-4, 2,-4

Step-by-step explanation:

this is the correct answer luv

It is a vertical line on 2 of the X axis

What is the first step in solving this expression? 28 - 11 + 6 ● 3 + 5

Thanks,

Answers

Answer:

First Step of solving this expression: Multiply

Answer for the expression: 40

Step-by-step explanation:

To find the first step you need to follow the order of operation

Parenthesis

Exponents

Multiplication and Division

Addition and Subtraction

Since there are not Parenthesis or Exponents then you may skip that step but there is a multiplication sign so the first step is Multiplication

To solve multiply 6 and 3

Which is 18

Now the expression looks like this:

28-11+18+5

Now simplify from left to right:

28-11=17

17+18=35

35+5=40

Hope this helps!

Answer: Multiply 6*3, then add 18+5, then subtract 28-11, then add them:

17 + 23 = 40!

Step-by-step explanation: PEMDAS:

Parenthesis

Exponents

Multiplication

Division

Addition

Subtraction

Does anyone know the answer to this question. I already tried A and C.

Answers

I think the answer would have to be D. If the diameter, which is the distance from one point on the circle through the center to another point on the circle, is halved then the amount of concrete that will be needed will be multiplied by 4. I think that's right I am so sorry in advance if that was incorrect. Have a beautiful rest of your day. Stay safe. C O V I D - 1 9 IS REAL THIS COULD MEAN YOUR LIFE!!!

Last year Anthony earned $24,000. After a brief lay-off this year, Anthony’s income is $18,500.


A.
30% increase


B.
30% decrease


C.
23% increase


D.
23% decrease

Answers

30% decrease because it’s all about subtract

I need help I’m being timed

Answers

I think it’s may be A, -(square root) X+2,-3 3down and 2 left

Pleaseeeee I’ll give first correct answer brainliest

Answers

Answer:

the bottom left one is right

Step-by-step explanation:

a school has 825 students and 55 teachers how ,many students are per teacher unit rate

Answers

Answer:

It would be 15 students per teacher unit

Step-by-step explanation:

You divide 825 students by 55 teachers

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