Equations of Lines from Points

Two Points Make a Line

It's easy enough to see that two points make a line when you're looking at a graph, but for the GED, you need to be able to start with the coordinate pairs of two points and write the equation of the line that passes through them.

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There's just two things you need to know in order to write the equation of a line in slope-intercept form- m, the slope, and, b, the y-intercept. Use the slope formula to find m then solve for b. Finally, plug those values into y=mx+b.

Watch the Virtual GED Class video below for a complete explanation and tons of worked example problems.



Example 1

Example 2

Example 3

Example 4

Extension 1

Challenge 1