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airrbae

  • one year ago

What is the solution for this system of linear equations? I'm stuck, y=-2x+1 y+7x-17 so -2x+1=7x-17 ??

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  1. satellite73
    • one year ago
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    if the second one is \(y=7x-17\) then yes

  2. satellite73
    • one year ago
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    \[-2x+1=7x-17\]

  3. satellite73
    • one year ago
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    add \(2x\) to both sides add \(17\) to both sides divide both sides by \(9\) will get you \(x\)

  4. satellite73
    • one year ago
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    if you want me to check your answer, let me know

  5. airrbae
    • one year ago
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    so I get 1=9x-17 then 9 divided 18 = 2? so x=2?

  6. satellite73
    • one year ago
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    you got it

  7. airrbae
    • one year ago
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    how would I find y with this one?

  8. satellite73
    • one year ago
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    then of course you have to find \(y\) but since you know \(x=2\) that should be easy

  9. satellite73
    • one year ago
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    replace \(x\) by \(2\) in either equation if you want to check to make sure your answer is right, put \(2\) for \(x\) in both and see if you get the same number

  10. airrbae
    • one year ago
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    is y=15? or y=3? I got a different answer when I pluged 2 into both problems /:

  11. satellite73
    • one year ago
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    should be the same lets check

  12. satellite73
    • one year ago
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    \[y=-2x+1\] \[y=-2\times 2+1=-4+1=-3\]

  13. satellite73
    • one year ago
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    \[y=7x-17\] \[y=7\times 2-17=14-17=-3\]

  14. satellite73
    • one year ago
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    so you should get \(y=-3\) for both, i am not exactly sure how you got the 15

  15. airrbae
    • one year ago
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    okay now I see what I did wrong there, hmmm! thank you for showing both, I wouldn't have seen it if you hadn't!

  16. satellite73
    • one year ago
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    yw

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