Complete the two questions for this practice. Please write your answers on a piece of scrap paper. When you are done, check your answers with the solution provided.

1. In the figure below, which line(s) (R, S, or T) has a positive slope? Which one(s) has a negative slope?
   
2. In the graphs below (a through f), which contain(s) a line with a positive slope? A negative slope? Slope of zero? Infinite slope?

[solution to practice]