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Mathematics
Karma Carroll
1 April, 23:59
X=y-8
-x-y=0
how many solutions
+4
Answers (
2
)
Asia Davila
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)
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Cher
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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