Artana/khan-exercises — comment on commit 63b6c6cdc6b96fbd00bca53a89ed6b762806c907
File: exercises/point_slope_form.html line 19
By smenks13:

This is up to you, but if this is supposed to be the introductory exercise to point slope form, maybe it's easier to restate the problem as "A line passes through both (x1, y1) and (x2, y2). Express the equation of the line in point slope form," which would eliminate the need to go through the motions of explaining that f(x1) is the same as y1. Might be easier, your call!