{15x+2y=7
{2x-y=6
{15x+2(2x-6)=7
{y=2x-6
15x+2(2x-6)=7
15x+4x-12=7
19x= 19
x= 1
{x= 1
{y= 2*1-6
{y= -4
{15x+2y=7
{2x-y=6
{15x+2(2x-6)=7
{y=2x-6
15x+2(2x-6)=7
15x+4x-12=7
19x= 19
x= 1
{x= 1
{y= 2*1-6
{x= 1
{y= -4