Question

What is the gradient of a line perpendicular to a line with a gradient of 5/ 6 ?

Answer 1

Answer:

Since the gradient of a line (this slope) is found to be 4, line A.

Any line that is ⊥ to another line will be the negative reciprocal of that slope.

Line A ‘s slope is 4, therefore, a line that is ⊥ to it will have a slope of -1/4.

m(1) ⋅ m(2) = -1

Answer is: -1/4