# Two Points to Linear Equations

- Author:
- Dr. Doug Davis, 3D

Two points define a line and a line can be represented as a linear equation in several forms.

- The Point-Slope form
- The Slope-Intercept form
- The General Form

Generally, one form can be converted into another form with a little algebra. There is one case where this is not true.
Can you find the case where algebra does not allow you to convert equation forms?
Which derived term appears directly in two of the forms?
Which form above has some simplification applied to the resulting equation?