Question 297925
x+2y=11 
2y=-x+11 
y=-x/2+11/2 (red line)
x=14-2y
2y=-x+14
y=-x/2+14/2
y=-x/2+7 (green line)
{{{ graph( 300, 200, -6, 20, -10, 10, -x/2 +11/2, -x/2 +7) }}} (graph 300x200 pixels, x from -6 to 20, y from -10 to 10, of TWO functions -x/2 +11/2 and -x/2 +7).