If f (3) = 9 and f ´(3) = 4, find the tangent line to the graph of f when x = 3.

Question

y = 4x - 3

y = 4x + 21

y = 9x - 23

y = 9x + 31

Answer 1

f '(3) = 4 says that the slope is 4 when x = 3
f)3) = 9 means that you are dealing with the point (3,9)

So they have given you the slope of the line and a point on it.
I am sure you can take it from there.