Question 138164
2x+y=-4
y=-2x-4 (red line)
------------------------
x-y=1
-y=-x+1
y=x-1 (green line)
{{{ graph( 300, 200, -6, 5, -10, 10, -2x -4, x -1) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -2x -4 and x -1). 
ANSWER(-1,-2)