x=y-8 -x-y=0 how many solutions ​

Question

x=y-8
-x-y=0
how many solutions

in progress 0
Claire 3 weeks 2021-09-26T16:36:17+00:00 2 Answers 0

Answers ( )

    0
    2021-09-26T16:38:10+00:00

    Answer:

    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.

    0
    2021-09-26T16:38:13+00:00

    Answer:

    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)

Leave an answer

45:7+7-4:2-5:5*4+35:2 =? ( )