Found this "puzzle" from Strang's Calculus.
The slope-intercept form of a line (y = mx + b) requires TWO numbers, the point-slope form (y - f(a) = f'(a)(x-a)) requires THREE numbers, and the two-point form requires FOUR (a, f(a), c, f(c)). How is this possible?
(suppose f'(a) = m).
I'm curious on this one. Any ideas on this "puzzle"?