Demand and Supply function graphs page 13, item 1, 9-7-2011

The Demand function has a slope of -0.7, so its graph is the one slanted downhill.
The Supply function has a slope of 1.5, so its graph is the one slanted uphill.

Homework for 9-8:  page 14, items 3 and 4, graphing a system of equations.