What is the slope of the graph of y = 3x - 6?

This is in slope intercept form,y=mx+b ,  where m is slope and b is y-intercept.  Therefore the slope of this one is 3.

Jboy is right on, the slope is 3. If it helps you picture this, here's a graph:

The slope is 3, or 3/1, meaning that when we go up 3 we have to go over 1, and you can see this on the graph.

There actually should be two arrows at the where the red line cuts off at the edges of the paper, indicating that it will go on forever in both directions.