5.30
Next
algebra I


Graphing equations in slopeintercept form quickly 

The slopeintercept form of a linear equation, y = mx + b, is convenient for quickly graphing the equation. We will graph the equation y = 1/2x − 4. The slope is m = 1/2 and the yintercept is b = −4. 

If m is not a fraction, you can write it as a fraction to identify the rise and the run. For instance, if the slope is −3, state it as −3/1. The rise is −3, the run is 1. The following activity walks you through the steps to graph the equation y = −3x + 1. This activity helps you practice graphing a line using the yintercept. 

Graph the yintercept. Then use the slope to find another point on the line and graph it. When you have graphed two correct points, the computer will draw the line. 

5.30
Next
algebra I
©20012010 Kinetic Books Company
