SOLUTION: x+y=12 x-y=4 slove using elimination

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Question 71411: x+y=12
x-y=4
slove using elimination
Answer by 303795(602) About Me  (Show Source):
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If you add the first equation to the second one you will eliminate the y.
x + y + x - y = 12 + 4
2x = 16
so x = 8
Substitute x = 8 back into your original first equation
x + y = 12
so 8 + y = 12
y = 4
Check that x = 8, y = 4 works in the second equation
8 - 4 = 4
Correct