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3x+y=5 /*(-4)
2x+4y=4
-12x-4y=-20
2x+4y=4
-10x=-16
x=8/5=1,6
y=5-3x=5-24/5=5-4,8=0,2
x=1,6
y=0,2
b)
-x+3y=4 /(-1)
2x+3y=1
x-3y=-4
2x+3y=1
3x=-3
x=-1
3y=1-2x=1+2=3
y=1
x=-1
y=1
c)
2x+2y=1
2x-2y=-1
4x=0
x=0
2y=1-2x=1
y=1/2
x=0
y=1/2