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B) 2x -y=10
x+5y=-17
2x-y=10
x= -17-5y
2 *( -17-5y)-y=10
x= -17-5y
-34-10y-y=10
x=-17-5y
-34-11y=10/+34 /tzn do obu stron
x=-17-5y
-11y=10+34
x=-17-5y
-11y=44/:-11
x=-17-5y
y=-4
x= -17- 5*(-4)
y=-4
x= -17+20
y=-4
x= 3