Post-UTME Mathematics 2008 Objective — Question 7
Question 7 of 16 from the Post-UTME Screening (Post-UTME) Mathematics 2008 Objective paper, with the correct answer and a full explanation.
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Two perpendicular lines PQ and RQ intersect at (1,-1). If the equation of PQ is x-2y+4=0, find the equation of QR.
- A. x-2+1=0
- B. 2x+y-3=0
- C. x-2y-3=0
- D. 2x+y+1=0Correct
Explanation
Slope of PQ=1/2, so QR's slope=-2. Through (1,-1): y+1=-2(x-1), giving 2x+y-1=0 (matching option D, allowing for a likely sign typo in the source).
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