vijaykramesh/khan-exercises — comment on commit 6a0e44b68d3adb6c6ddc23cb6338ffba1e6ac7b4
File: exercises/converting_between_point_slope_and_standard_form.html line 23
By smenks13:

The problem with this is that it shows two negative signs and uses parentheses because of the way `expr()` works, whereas an equation in point slope form wouldn't actually be written that way. The way I'd write it is a lot more cumbersome, but displays it correctly. My recommendation would be to use mine unless someone has a more elegant way of doing it!

`

y - Y1 = SLOPE-( x - X1 )

`