JAMB Mathematics 2020 Objective — Question 20

Question 20 of 40 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2020 Objective paper, with the correct answer and a full explanation.

Find the equation of the line which passes through (-2,1) and is perpendicular to the line 4x-2y+1=0.

A. 2y-x-4=0
B. 2y+x=0Correct
C. 2y-x=0
D. y-2x-5=0

Explanation

4x-2y+1=0 gives gradient m1=2. Perpendicular gradient m2=-1/2. Through (-2,1): y-1=-1/2(x+2). 2y-2=-x-2. 2y+x=0.

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