We study the slopes of line graphs, which is to measure the steepness of a straight line, and is defined to be ratio of y rise over x run, or the ratio of vertical change over the horizontal change.

We talk about the meaning of positive slope and negative slope. We study the special cases of horizontal line where the slope is always 0, and vertical lines where the slope is undefined.

We practice on how to calculate slopes based on the given information.

Homework:

Page 11, #9 to #17.