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Andrew Prock · Answer 1 · 2018-03-10T17:27:42+0000

If 2 lines (or line segments) are perpendicular, then the product of their slopes is equal to -1.

Thus, since the given line segments are perpendicular, we have:

$\displaystyle{ (1)/(3)\cdot (d)/(5)=-1$ .

Multiplying both sides of the equation by 15, we get d=-15.

Answer: d=-15

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