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Discord

  • 3 years ago

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

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  1. AriPotta
    • 3 years ago
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    well, you know that y = 4x + 8, so you just substitute that for y in the first equation

  2. rainbow22
    • 3 years ago
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    y=2x+10 2x+10=4x+8 solve

  3. rainbow22
    • 3 years ago
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    2x+2=4x 2x=2 x=1

  4. AriPotta
    • 3 years ago
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    do you know what to do now?

  5. Discord
    • 3 years ago
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    Actually can do do it again. I'm still lost.

  6. rainbow22
    • 3 years ago
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    first you would find y in terms of x

  7. AriPotta
    • 3 years ago
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    it would be (4x + 8) - 2x = 10

  8. AriPotta
    • 3 years ago
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    so you combine like terms first

  9. AriPotta
    • 3 years ago
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    4x and -2x being like terms

  10. Discord
    • 3 years ago
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    How do you get -2x?

  11. AriPotta
    • 3 years ago
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    because in our equation, it says (4x + 8) - 2x = 10. minus 2x is the same as -2x

  12. AriPotta
    • 3 years ago
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    so to combine 4x and -2x, it would be 4x - 2x, which is...

  13. Discord
    • 3 years ago
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    Oh man. I wrote that backwards.

  14. Discord
    • 3 years ago
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    Its y = 2x - 10

  15. AriPotta
    • 3 years ago
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    what? can you write the whole question correct? :/

  16. Discord
    • 3 years ago
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    Its y = 2x - 10 y = -4x + 8

  17. AriPotta
    • 3 years ago
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    oh

  18. AriPotta
    • 3 years ago
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    ok, so it would be 2x - 10 = -4x + 8

  19. AriPotta
    • 3 years ago
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    now you have to add 4x to both sides

  20. AriPotta
    • 3 years ago
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    wait.

  21. AriPotta
    • 3 years ago
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    nvm, continue doing that

  22. Discord
    • 3 years ago
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    Alright thanks. I understand now.

  23. AriPotta
    • 3 years ago
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    oh ok.

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