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x+2y=-2
2x-y=1
x=-2-2y
2x-y=1
x=-2-2y
2(-2-2y)-y=1
x=-2-2y
-4-4y-y=1
x=-2-2y
-5y=1+4
x=-2-2y
-5y=5
x=-2-2y
y=-1
x=-2-2*(-1)
y=-1
x=-2+2
y=-1
x=0
y=-1
2.
x+4y=-2
3x-8y=10
x=-2-4y
3x-8y=10
x=-2-4y
3(-2-4y)-8y=10
x=-2-4y
-6-12y-8y=10
x=-2-4y
-20y=10+6
x=-2-4y
y=16/20
x=-2-4y
y=4/5
x=-2-4*(4/5)
y=4/5
x=-2-16/5
y=4/5
x=-10/5-16/5
y=4/5
x=-26/5
y=4/5
x=-5 i 1/5
y=4/5