Question

What is the value of x and y

Answer 1

x = 5 ; y = 0

First, square root x^2 + y^2 = 25, then you get x + y = 5
Elimination. Multiply x + y = 5 by -1, then you get -x - y = -5.

2x + y = 10
-x - y = -5
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x = 5