Question

y - 2x = 10
y = 4x + 8
Solve by substitution.

Answer 1

well, you know that y = 4x + 8, so you just substitute that for y in the first equation

Answer 2

y=2x+10
2x+10=4x+8
solve

Answer 3

2x+2=4x
2x=2
x=1

Answer 4

do you know what to do now?

Answer 5

Actually can do do it again. I'm still lost.

Answer 6

first you would find y in terms of x

Answer 7

it would be (4x + 8) - 2x = 10

Answer 8

so you combine like terms first

Answer 9

4x and -2x being like terms

Answer 10

How do you get -2x?

Answer 11

because in our equation, it says (4x + 8) - 2x = 10. minus 2x is the same as -2x

Answer 12

so to combine 4x and -2x, it would be 4x - 2x, which is...

Answer 13

Oh man. I wrote that backwards.

Answer 14

Its y = 2x - 10

Answer 15

what? can you write the whole question correct? :/

Answer 16

Its y = 2x - 10
y = -4x + 8

Answer 17

oh

Answer 18

ok, so it would be 2x - 10 = -4x + 8

Answer 19

now you have to add 4x to both sides

Answer 20

wait.

Answer 21

nvm, continue doing that

Answer 22

Alright thanks. I understand now.

Answer 23

oh ok.