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Solving by elimination
2x + y = 8 | 2*3 + 2 = 8
y = -x + 5 OR -x-y= -5
2x + y = 8
-x - y = -5
x = 3 and y = 2 |(y =-x+5)
Solving by substtution
y = -x + 5
2x + y = 8
2x + (-x+5) = 8
x = 3 and y = 2 |(y =-x+5)