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airrbae

  • 2 years ago

What is the solution for this system of linear equations? please explain!! y=x-8 y=8x-71

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  1. yoyointegrals
    • 2 years ago
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    set them equal to eachother, you will end up with x-8 = 8x -71, solve for x

  2. airrbae
    • 2 years ago
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    then what do you do? im confused?

  3. yoyointegrals
    • 2 years ago
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    start by adding 71 to both sides

  4. airrbae
    • 2 years ago
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    x=63?

  5. yoyointegrals
    • 2 years ago
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    close, divide by the coefficient of the x

  6. airrbae
    • 2 years ago
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    whats the coefficient?

  7. yoyointegrals
    • 2 years ago
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    7

  8. airrbae
    • 2 years ago
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    so I have 8x-71=1x=8 explain to me what I do from here? I subtract 71 from both sides here?

  9. satellite73
    • 2 years ago
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    i would start by subtracting \(x\) from both sides, to put all the terms with \(x\) on the left

  10. satellite73
    • 2 years ago
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    in other words get \(7x-71=-8\)

  11. electrokid
    • 2 years ago
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    solution of a set of equation means |dw:1364000497143:dw| find the point P(x,y) which satisfies all the equations.

  12. satellite73
    • 2 years ago
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    then add 71 to both sides to get \[7x=63\] and finally divide both sides by \&\)

  13. satellite73
    • 2 years ago
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    that, is , finally divide both sides by \(7\)

  14. airrbae
    • 2 years ago
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    so the answer for x=9?

  15. yoyointegrals
    • 2 years ago
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    correct.

  16. airrbae
    • 2 years ago
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    so how would I find y now since I know x?

  17. satellite73
    • 2 years ago
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    you replace \(x\) by \(9\) in either equation

  18. airrbae
    • 2 years ago
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    wait, is y=1?

  19. satellite73
    • 2 years ago
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    yes

  20. satellite73
    • 2 years ago
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    \[y=x-8\] \[y=9-8=1\]

  21. airrbae
    • 2 years ago
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    omg thank you so much! you're amazing!

  22. krissywatts
    • 2 years ago
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    set them side by side like this: x-8=8x-71 subtract -8 on both sides and add 8 to both sides now you should get -7x=-63

  23. satellite73
    • 2 years ago
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    yw (if you meant me, if not, then yw from everyone )

  24. krissywatts
    • 2 years ago
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    now plug byour answer back into the first equation to get y

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