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-4x+y=2
4x+8y=16
-4x+y=2
9y=18 /: 9
y= 2
-4x+2=2
-4x=2-2
-4x=0
x=0
y= 2
x=0
D.2x+4y=5y-1
y+5=0
2x+4y=5y-1
y=-5
2x+4*-5=5*-5-1
2x-20=-25-1
2x-20=-26
2x=-26+20
2x=46/:
x=23
y=-5
x=23