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 ▸Integrate, by parts, y=xln(x),
Integrate the following function by parts and reduce it to it's simplest form. f(x) = ln(x).
The height (h) of water flowing out of a tank decreases at a rate proportional to the square root of the height of water still in the tank. If h=9 at t=0 and h=4 at t=5, what is the water’s height at t=15? What is the physical interpretation of this?
The variables x and y are related by y = 5^x. How do I find the value of x when y is set to 15?