Question 81925
x-2y=8, -2y=-x+8, y=-x/2+8/-2, y=-x/2-4
x=y=-1, y=-x-1
{{{ graph( 300, 200, -6, 7, -10, 10, y = -x/2 -4, y = -x -1) }}} (graph 300x200 pixels, x from -6 to 7, y from -10 to 10, y = -x/2 -4 and y = -x -1). 
x=6, y=-7