Mathematics for IGCSE & O level - Coordinate Geometry (Section 3 - No. 38)

What is the gradient of a line perpendicular to a line with equation y = -2/5x + 3?

2/5

-2/5

5/2

-5/2

Perpendicular lines have negative reciprocal gradients. The negative reciprocal of -2/5 is 5/2.