Question

If the gradient of a line, A, is 4, what is the gradient of a line which is perpendicular to A?

Answer 1

m = - 1/4

Explanation:

When two line is perpendicular to each other the product of them is - 1

So let the other line be B

Gradient of B = t

Gradient of A = 4

`t * 4 = - 1 \\ t = - (1)/(4)`

therefore m = - 1/4