Question

Line t passes through points (3, 11) and (8, 4). Line u passes through points (1, 4) and (8, 9). Are line t and line u parallel or perpendicular?

Answer 1

The lines t and u are perpendicular.

Explanation:

m=(y2-y1)/(x2-x1)

m=(4-11)/(8-3)

m=-7/5

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m=(y2-y1)/(x2-x1)

m=(9-4)/(8-1)

m=5/7

Perpendicular lines have negative reciprocal slopes.