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a)
y-3x=0
y+2x=0 | *(-1)
y-3x=0
-y-2x=0
-5x=0
x=0
y=0
b)
6x-5y=7
x-y=0 |*(-6)
6x-5y=7
-6x+6y=0
y=7
6x-5*7=7
y=7
6x=42
y=7
x=7
c)
x-4y=2
x-5y=11 |*(-1)
x-4y=2
-x+5y=-11
y=-9
x-4*(-9)=2
y=-9
x=-34