I'm having a little bit of a problem with a simple question, that I know the answer to, but don't know the working to get the answer.
The question is as follows:
A(-2, 2) and C(3, -1) are opposite vertices of kite ABCD. Find the gradient of diagonal BD.
I know the answer is 5/3 but I don't know *how* that is the answer.
If someone could possibly tell me the formula, it would put my mind at rest.