Question 48813
x-y=6   graph the equation
x-y=6
multiply both sides by -1
-x+y=-6
transpose x to other side
+y=-6+x
y=x-6

The points required are 
x,	y
3,	-3
6,	0
9,	3

So plot the three points (3,-3), (6,0) & 9,3)and join them
You have the st line.
OK.