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x + 2,5 = y
3x=2y
x-y=-2,5 /*(-3)
3x-2y=0
-3x+3y=7,5
____________
y=7,5
x=5
2.x/5 - y/4 =0 /*20
x/2 - y/16 = 5,5 /*16
4x-5y=0 /*(-2)
8x-y=88
-8x+10y=0
8x-y=88
_________
9y=88
y=88/9
x=110