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-3x+2y=-7/*5
5x+2y=1/*(-3)
-15x+10y=35
-15x-6y=-3
4y=32/4
y=8
5x+2*8=1
5x+16=1
5x=1-16
5x=-15/5
x=3
x=3
y=8
-5x -2y = - 1
-8x = -8
-x = -1
x=1
-15x+10y= - 35
15x + 6y= 3
16y= - 32
y=-2
x=1
y= -2
Sprawdzenie
-3*1+2*(-2)= -7
-7=-7