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anonymous

  • 5 years ago

how do you get the answer to (x-y=-5 (-x+4y=10

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  1. anonymous
    • 5 years ago
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    all i know is you use substitution

  2. anonymous
    • 5 years ago
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    add the two equations and post what you got.

  3. anonymous
    • 5 years ago
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    what do you mean by add them

  4. anonymous
    • 5 years ago
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    steps: x-y=-5 -x+4y=10 despejas x x=-5+y 5-y+4y=10 3y=5 y=5/3 ahora en x-y=-5 x-(5/3)=-5 x=-10/3

  5. anonymous
    • 5 years ago
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    x-y = 5 -------> Equation 1 -x+4y = 10 ------------> Equation 2 Add equations 1 and 2

  6. anonymous
    • 5 years ago
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    oh also if it helps im only in 8th grade

  7. shadowfiend
    • 5 years ago
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    By `add' he means basically add each part (the parts with x, the parts with y, and the parts with neither) in each equation, and see what the resulting equation is.

  8. anonymous
    • 5 years ago
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    No shadow fiend. The problem is different. These answers were getting jumbled up, with another post

  9. anonymous
    • 5 years ago
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    so -x=4y=5

  10. anonymous
    • 5 years ago
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    if (3 x 4 ) = 12 and (5 x 4) = 20, then when we add the equations we get (3 x 4) + (5 x 4) = 12 + 20 12 + 20 = 32 32 = 32. so it checks out. similarly add your equations,

  11. anonymous
    • 5 years ago
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    meaning (x-y) +(-x+4y) = -5 + 10

  12. anonymous
    • 5 years ago
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    wow this is even more confusing now

  13. anonymous
    • 5 years ago
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    what is confusing about this?

  14. shadowfiend
    • 5 years ago
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    So, norbeybarajas gave another good answer, both will lead you to the same path. If you add the two equations up, you'll see that the x disappears and you can solve for y.

  15. anonymous
    • 5 years ago
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    ok thx for the answers not confusing any more

  16. anonymous
    • 5 years ago
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    do you understand that if a = b and c = d, then a+c will be equal to b+d?

  17. anonymous
    • 5 years ago
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    yeah

  18. shadowfiend
    • 5 years ago
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    Rock it. Make sure you click `good answer' next to the answers that were helpful :)

  19. anonymous
    • 5 years ago
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    alright can do

  20. anonymous
    • 5 years ago
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    okay, so that is exactly what I did in your equation. I saw that one equation had x and the other equation had -x. so I knew that if i added them up, the x will cancel each other out, leaving me only with y. which means i can solve for y.

  21. anonymous
    • 5 years ago
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    yeah

  22. anonymous
    • 5 years ago
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    once I solve for y, all i need to do is substitute it in one of the equations and get x.

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