# Explore the Properties of a Straight Line Graph

Move the **m** and **b** slider bars to explore the properties
of a straight line graph. See:

- The effect of changes in m
- The effect of changes in b
- The effect of a negative value of m
- The effect of a negative value of b
- How to create a horizontal line

../algebra/images/graph-straight-line.js

Read more about the Equation of a Straight Line

## Find the Equation from 2 Points

Now see how two points can change the line equation. Try to make:

- y = x
- y = x + 2
- y = −2x + 8
- y = 4
- x = 4

../geometry/images/geom-line-equn.js?mode=equn