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{3x + 15 = y
{4x-y=-12
{3x-y=-15 /×(-1)
{4x-y=-12
{-3x+y=15
x=3
-3x+y=15
y=15+3x
y=15+3×3
y=15+9
y=24
spr. 4x-y=-12
4×3-24=-12
12-24=-12
-12=-12
3x + 15 = y
4x-y=-12|*(-1)
3x-y=-15
-4x+y=12
3x-y=-15
-x=-3
x=3
-y=-24
y=24