How can you verify the slope of a line just by looking at its graph? Think rise over run. Slope is a ratio between the change in *y* and the change in *x*. In fact, slope is written in the following format:

**rise/run**

Refer to the image of the graph of *y*= 1/2*x* + 2 and choose a couple of points on the line.

Point A (-4,0) and Point B (0,2)

Start with the rise. Put your finger on Point A and count

up until you are across from Point B. You moved up 2

units; rise is 2.

Continue with the run. Move your finger to the right

until you are at Point B. You moved across 4 units;

run is 4.

Therefore: rise/run = 2/4.

Simplify and discover that the slope of the line is 1/2.

**Quick tip for rise:** Move your finger up, and rise is positive. Move your finger down, and rise is negative.**Quick tip for run:** Move your finger to the right, and run is positive. Move your finger to the left, and run is negative.