Question

k

Answer 1

Do you know what an equation of a line looks like?
There are two forms I find most useful
Slope-intercept form y=mx+b
point-slope form y-y_1=m(x-x_1)
It really doesn't matter which one you use.
It looks like you already found the general slope formula for f
Use that formula to acquire the slope at x=1

Answer 2

Right those somethings is a point you know on the line

Answer 3

Do you know a point (x_1,y_1) on the line?

Answer 4

Or also on the curve at say ....x=...

Answer 5

by definition a tangent line touches at only 1 point. what point is that ?
(for this problem)

Answer 6

that point is the point in which phi speaks of

(disclaimer: the graph may not reflect the correct y-intercept for the tangent line; this is a rough drawing)