## Discord 3 years ago y - 2x = 10 y = 4x + 8 Solve by substitution.

1. AriPotta

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

2. rainbow22

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

3. rainbow22

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

4. AriPotta

do you know what to do now?

5. Discord

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

6. rainbow22

first you would find y in terms of x

7. AriPotta

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

8. AriPotta

so you combine like terms first

9. AriPotta

4x and -2x being like terms

10. Discord

How do you get -2x?

11. AriPotta

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

12. AriPotta

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

13. Discord

Oh man. I wrote that backwards.

14. Discord

Its y = 2x - 10

15. AriPotta

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

16. Discord

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

17. AriPotta

oh

18. AriPotta

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

19. AriPotta

now you have to add 4x to both sides

20. AriPotta

wait.

21. AriPotta

nvm, continue doing that

22. Discord

Alright thanks. I understand now.

23. AriPotta

oh ok.