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anonymous

  • 5 years ago

Solve by the addition method. (You may first have to multiply both sides of one equation by -1) Problem: 3x+y=13 x+y=3

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  1. anonymous
    • 5 years ago
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    mult both sides of 2nd equation with -1 then add 2 equations together, so y is gone, now u can find x, then plug result found for x in any of the 2 equations to get y.

  2. anonymous
    • 5 years ago
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    so would I do it like this: x+ (-1) y=3(-1) ? then solve

  3. anonymous
    • 5 years ago
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    you need x to times -1 too, like this (-1)(x+y)=3(-1) (-1)x + (-1)y = 3(-1)

  4. anonymous
    • 5 years ago
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    so x = -5?

  5. anonymous
    • 5 years ago
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    nope, x=5

  6. anonymous
    • 5 years ago
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    How would you do this equation: x + 2y = -2 4x + 2y = -17 ?

  7. anonymous
    • 5 years ago
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    would x be -5 and y be -3/2?

  8. anonymous
    • 5 years ago
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    you get the last one right? So its the same for this one. time the first equation with (-1) (-1)(x+2y)=(-2)(-1) -x -2y = 2 then add this to the 2nd

  9. anonymous
    • 5 years ago
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    you got x right but y is wrong

  10. anonymous
    • 5 years ago
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    check ur work, y should be 3/2

  11. anonymous
    • 5 years ago
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    I accidently put the - I had 3/2. See if you can help me with this problem: -5=10x+3y -1= 2x-3y?

  12. anonymous
    • 5 years ago
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    lol this is even simpler, you dont need to change anything, just add them straight

  13. myininaya
    • 5 years ago
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    x=5

  14. myininaya
    • 5 years ago
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    not -5

  15. anonymous
    • 5 years ago
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    I told you the problem wrong, I'm sorry : -5=-10x+3y 1=2x-3y

  16. myininaya
    • 5 years ago
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    its still a good problem

  17. anonymous
    • 5 years ago
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    same thing -5 = -10x + 3y + 1 = 2x + (-3y) __________________________________ -4 = -8x + 0 then x=2, so find y

  18. anonymous
    • 5 years ago
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    lol sorry 1/2, I should go back to kindergarten

  19. myininaya
    • 5 years ago
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    lol i was just fixing to say that

  20. myininaya
    • 5 years ago
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    not the kindergarten part

  21. anonymous
    • 5 years ago
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    yep, that was stupid

  22. anonymous
    • 5 years ago
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    So is y 5?

  23. anonymous
    • 5 years ago
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    which question do you mean? the last one with -5=-10x...., y should be 0

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