Right. The "x1" and "y1" shown in the point-slope formula don't necessarily refer to the same coordinates as the "x1" and "y1" in the *slope* formula. In the point-slope formula, the reason those subscripts of 1 are there is simply to distinguish that an actual value gets plugged into that place, whereas the x and y variables without the subscript are just meant to be left as variables when the equation is written out.