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3x+2y=9
-4x-2y=-14
3x+2y=9
------------ +
-x=-5 /*(-1)
x=5
2*5+y=7
y=7-10
y=-3
x=5 y=-3
3x+2y=9
------------
y=7-2x
3x+2(7-2x)=9
3x+14-4x=9
-x=9-14
-x=-5
x=5
y=7-2x
y=7-2*5
y=7-10
y=-3
x=5
y=-3