Question 272012
Solve by graphing:
x-y = 4
x+y = 8
Rewrite these as:
y = x-4
y = -x+8
Now graph them:
{{{graph(400,400,-5,10,-5,5,x-4,-x+8)}}}
Notice that the lines intersect at (6,2) so this is the solution to this system of equations.