Engineering Board Exam Reviewer · Distance Between Two Points · medium

If the distance between points (3,y) and (8,7) is 13, then y is equal to

1. 5 or -5
2. 5 or 19
3. 19
4. -5 or 19

Answer

D. -5 or 19

Solution

132 = (8-3)2 + (7-y)2 169 = 25 + (7-y)2 (7-y)2 = 144 7-y = 12 y = -5 or y = 19.

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