Question: Rework Exercise 85, where the word parallel is replaced by the word perpendicular. Find the value of a for which the line through the points

Rework Exercise 85, where the word parallel is replaced by the word perpendicular.
Find the value of a for which the line through the points (a, 1) and (2, -3.1) is parallel to the line through the points (-1, 0) and (3.8, 2.4)

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