Why is the inverse of a gradient -1/x?
Because the value, x and its inverse, -1/x should multiply together to give -1. This is proof that two lines are perpendicular (or having the same magnitude of gradient but opposite signs +/- ).
SR
Related Maths A Level answers
All answers ▸Find the exact value of dy/dx at (-2,4) of the curve C: 4x^2 -y^2 + 6xy + 2^y = 0
differentiate with respect to x: (x^3)(e^x)
When Integrating by parts, how do you know which part to make "u" and "dv/dx"?
I don't fully understand the purpose of integration. Could you please explain it to me?