Now let's calculate the tangent line to the function f (x) = 1 - 7x at x = 5. a. By using f' (a ) from part 2, the slope of the tangent line to f at x = 5 is f' (5) = b. The tangent line to f at x = 5 passes through the point (5, f (5) ) = on the graph of f. (Enter a point in the form (2, 3) including the parentheses.) C. An equation for the tangent line to f at x = 5 is y =