Question

if y=f(x), then what is dy/dx equal to?
the answer is Limit [f(x-delta x)-f(x)]/delta x
explain the answer.

Answer 1

http://en.wikipedia.org/wiki/Derivative

Answer 2

dy/dx is equal to the derivative of f(x). The definition of a derivative for a function f(x) is lim h -> 0 for (f(x + h) - f(x))/h.
h = delta x

Answer 3

can i be explained how the limits and delta fit in here according to the Q.although i have the concept that its about rate of change of one thing with respect to another.