Algebra-1

Question Analysis
This question tests the student's ability to calculate the slope of a line passing through two points and then find the slope of a line perpendicular to it. The key concept is that the product of the slopes of two perpendicular lines is .

Key Concept Explanation
Perpendicular lines are lines that intersect at a right angle (90 degrees), and the product of their slopes is . If two lines are perpendicular, then .

Step-by-step Solution
1. Calculate the slope of the line passing through the points and :

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