Find the equation of the straight line through ... - JAMB Mathematics 2014 Question
Find the equation of the straight line through (-2, 3) and perpendicular to 4x + 3y - 5 = 0
A
3x - 4y + 18 = 0
B
3x + 2y - 18 = 0
C
4x + 5y + 3 = 0
D
5x - 2y - 11 = 0
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Correct Option: A
4x + 3y - 5 = 0 (given)
The equation of the line perpendicular to the given line takes the form 3x - 4y = k
Thus, substitution x = -2 and y = 3 in 3x - 4y = k gives;
3(-2) - 4(3) = k
-6 - 12 = k
k = -18
Hence the required equation is 3x - 4y = -18
3x - 4y + 18 = 0
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