Question

find dy/dx from first principles given y=4-x

Answer 1

dy /dx


is limit as h --> 0

of f(x + h) - f(x)
------------
h

Answer 2

so where does y=4-x go to?

Answer 3

y is a function of x, so you can rewrite y=4-x as f(x)=4-x

Answer 4

thankyou