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3x+y=5 /*5
2x-5y=9
15x+5y=25
________
17x=34
x=2
2*2-5y=9
4-5y=9
-5y=5
y=-1
x=2
y=-1
x+3y=4 /*(-2)
2x-y=1
-2x-6y=-8
2x-y=1
_________
-7y=7
y=-1
x+3*(-1)=4
x-3=4
x=7
x=7
y=-1