Question 103396
{{{ graph( 300, 300, -2, 12, -5, 10, 11-x, x-7)}}} 
Looks like the lines intersect at x=9.
When x = 9, then using the first equation:
{{{x+y=11}}}
{{{9+y=11}}}
{{{y=2}}}
When x = 9, then using the second equation:
{{{x-y=7}}}
{{{9-y=7}}}
{{{y=2}}}
So the intersection point (solution) is (9,2).