Think about how much money you could make if you were working at a job.  You could graph your earnings on the vertical axis, and your earnings on the horizontal axis.  You would have a graph where your total earnings were increasing over time.  What would the graph look like if your hourly rate was higher? What if it was lower?

When you graph a line, you can think about how it looks.  It may be increasing to the right, decreasing to the right, or staying constant/flat.

Today, we will be looking at how the steepness of the line can be assigned a number.


  • Notes: Slope of a Line


  • p325 #1-8, 11, 12, 14 *16 *18

Things you should know after today:

  • the definition of the slope of a line
  • how to determine the slope of a line using a graph
  • how to determine the slope of a line segment between two coordinates using an equation
  • how to draw a line if you are given a coordinate and a slope