Definition: Perpendicular lines are lines that intersect at a 90 degree angle. On the coordinate plane, perpendicular lines have opposite, reciprocal slopes.
Example: Identify the pair of perpendicular lines:
We know perpendicular lines intersect at a 90 degree angle. Using this information we can identify which pair of lines is perpendicular.
Step 1: Compare the given pairs of lines.
Step 2: Since Pairs 1, 2 and 4 do not intersect at 90 degree angles, we can determine pair 3 to be the best answer.
Option 3 best fits represents our definition of perpendicular lines.
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