Question

{+3+7y=38
{-x-x7y=-36

Answer 1

3 + 7y = 38
7y = 38 - 3
7y = 35
y = 5
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-x - 7xy = -36
-x - 7.x.5 = -36
-x - 35x = -36
-36x = -36
x = 1