Segment has endpoints and . At what -coordinate does the perpendicular bisector of cross the -axis?
Answer and explanation
Correct answer: D.
- Step 1: The midpoint of is and the slope of is .
- Step 2: The perpendicular bisector has slope : .
- Step 3: Set : , so and .
Answer
.
Why not the others: uses slope ; uses slope ; is where line itself crosses the -axis.
Practise more Lines and slope.
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