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6x + 7y = -6 |-4
24x + 30y = -24
-24x -28y = 24
2y = 0
6x + 7y = -6
-6x-7,5x=6
6x+7y=-6
14,5x=0
równanie sprzeczne
{
6x+7y=-6/2
-12x-15y=12
{
12x+14y=-12
________________
0-y=0/(-1)
y=0
{
4x+0=-4
y=0
{
4x=-4/4
y=0
{
x=-1