Post-UTME Mathematics 2013 Objective — Question 27
Question 27 of 100 from the Post-UTME Screening (Post-UTME) Mathematics 2013 Objective paper, with the correct answer and a full explanation.
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Two perpendicular lines PQ and QR intersect at (1,-1). If the equation of PQ is x-2y+4=0, find the equation of QR.
- A. x-2y+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.
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