Question: Show that the line containing the points (a, b) and (b, a), a b, is perpendicular to the line y = x. Also show

Show that the line containing the points (a, b) and (b, a), a ≠ b, is perpendicular to the line y = x. Also show that the midpoint of (a, b) and (b, a) lies on the line y = x.

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