Question 292622
y = -x - 1 (RED LINE)
2x - y = 10
-Y=-2X+10
Y=2X-10 (GREEN LINE)
{{{ graph( 300, 200, -6, 5, -10, 10, -x -1, 2x -10 ) }}} (graph 300x200 pixels, x from -6 to 5, y from -10 to 10, of TWO functions -x -1 and 2x -10). 
SOLUTION (3,-4)