Answers:
f ' (1) = 2
f ' (a) = 2
Work Shown
f(x) = 2x + 3
f ' (x) = 2
f ' (1) = 2
f ' (a) = 2
It turns out that no matter what input you plug in, the derivative output is always 2. This is the slope of the line. The plus 3 at the end does not affect the derivative since that portion goes to zero.