Which formula can be used to find the slope of a line from two points (x1,y1) and (x2,y2)?

Question

x2−x1y2−y1

y2y1−x2x1

y2+y1x2+x1

y2−y1x2−x1

only answer the question

Answer 1

The formula to find the slope of a line from two points (x1,y1) and (x2,y2) is:

y2−y1 / x2−x1