Suppose that a functionfis differentiable at x = 1 and

$\displaystyle \\lim_{h \to 0} \frac{f(1 + h)}{h} = 5 $

Findf(1) andf'(1).

So, dy/dx at x = 1 is 5.

So the equation of the tangent line is y - f(1) = 5(x - 1).

But how can I find f(1)?