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2x-3y = -18
-y = 10-2x /-1
2x-3y = -18
y = -10+2x
2x-3(-10+2x) = -18
y = -10+2x
2x+30-6x = -18
y = -10+2x
2x-6x = -18-30
y = -10+2x
-4x = -48 / (-4)
y = -10+2x
x = 12
y = -10+2*12
x = 12
y = 14
x = 12
2x-3y=-18
2x-y=-10
-2x+3y=18
2y = 8
y = 4
2x-y=-10 to dla y=4 ma postać
2x-4=-10 dlatego:
2x=-6
x= -6/2 - -3