Question 134519
X-2Y=6
-2Y=-X+6
Y=-X/-2+6/-2
Y=X/2-3 
{{{ graph( 300, 200, -6, 6, -10, 10, x/2 -3) }}} (graph 300x200 pixels, x from -6 to 6, y from -10 to 10, x/2 -3). 
X-----Y
0-----3
1--(-2.5)
2---(-2) 
6-----0
(-6)-(-6)