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1 April, 23:59

X=y-8

-x-y=0

how many solutions

+4
Answers (2)
  1. 2 April, 00:09
    0
    one solution

    Step-by-step explanation:

    x=y-8

    -x-y=0

    Substitute the first equation into the second equation

    - (y-8) - y = 0

    -y + 8 - y = 0

    -2y + 8 = 0

    Add 2y to each side

    -2y+2y + 8 = 2y

    8 = 2y

    Divide each side by 2

    8/2 = 2y/2

    4 = y

    x = y-8

    x = 4-8

    x=-4

    (-4,4)
  2. 2 April, 00:24
    0
    1 (-4,4)

    Step-by-step explanation:

    The first step I did was make these equations more graphable, making x=y-8 into x+8=y and - x=y. Then I had graphed these two, and observed the intersection they made. Also another way is using algebra, you can turn x=y-8 into x-y+8=0, and then x-y+8=-x-y, using that we can find - 4 = x, and y = 4, that would be the only solution.
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