Parallel & Perpendicular Lines

Parallel or Perpendicular?

Example 1

Determine whether the lines are parallel, perpendicular or neither. One line passes through points (2, 11) and (-1, 2); another line passes through points (0, -4) and (-2, -10).

Step 1. Determine the slope of each line.

p_ex1-1

Step 2. Compare the slopes.

The slopes are equal, so the lines are parallel.

*Note: points from the same line would also produce equal slopes, verify that these are two different lines by graphing each set of points.