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x/2+2 y = 7
3 x+5 y = 9
x/2+2 y = 7
3 x+5 y = 9
x/2 = 7-2 y
3 x+5 y = 9
x = 14-4 y
3 x+5 y = 9
x = 14-4 y
3 (14-4 y)+5 y = 9
3 (14-4 y)+5 y =
5 y+(42-12 y) = 42-7 y:
x = 14-4 y
42-7 y =9
x = 14-4 y
42-7 y = 9
x = 14-4 y
-7 y = -33
x = 14-4 y
y = 33/7
x = -34/7
y = 33/7
(x+y)=(-34/7)+(33/7)
(x+y)=-1/7
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