When do you use point slope form

You use point-slope form when you know (or can determine) the slope and the coordinates of one point on the line.

Step-by-step explanation:

You use point-slope form when you know (or can determine) the slope and the coordinates of a point. So, either you are given the slope of the line and a point on the line, or you are given two points on the line and you use the points to determine the slope.