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Homework Statement
If the tangent line to y = f (x) at (9,7) passes through the point (0,6), find the following.
(a) f (9)
(b) f ' (9)
Homework Equations
f '(x) = f(x+h) - f(x)/h ?
The Attempt at a Solution
I really have no idea how to even begin going about this one, so a shove in the right direction would be greatly appreciated.