Math CentralQuandaries & Queries


Question from Brendon, a student:

points A (-4; 6) , B (1;-2), C (5;-3) and D (4; 1) are given prove that AC and BD are perpendicular to each other

Hi Brendon,

Find the slopes of the line through AC and the line through BD. What property of the slopes of lines proves the lines are perpendicular?


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