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y=-2
{ax+by=7
{4x-2by=2a+6
{-3a-2b=7
{4*(-3)-2*(-2)b=2a+6
{-3a-2b=7
{-12+4b=2a+6
{-3a-2b=7
{-2a+4b=6+12
{-3a-2b=7/*2
{-2a+4b=18
{-6a-4b=14
{-2a+4b=18
----------------------
-6a-2a=14+18
-8a=32/:(-8)
a= -4
-6a-4b=14
-6*(-4)-4b=14
24-4b=14
-4b=14-24
-4b=-10/:(-4)
b=2,5
a= -4
b=2,5