Mathematics for IGCSE & O level - Coordinate Geometry (Section 3 - No. 40)
Which of the following is the gradient of a line that is perpendicular to a line with equation y = 2/3x + 5?
2/3
-2/3
3/2
-3/2
คำอธิบาย
The perpendicular gradient is the negative reciprocal of the original gradient, -3/2