(0,6) and (7,10) perpendicular?

Question

(0,6) and (7,10) 

 (3,-10) and (10,-6) 

Answer 1

Assuming (0,6) and (7,10) are points on one line, and (3,-10) and (10,-6) are points on another line, find the slopes of both lines.  If the product of the slopes is -1, the lines are perpendicular.  Do you know how to find the slope of a line given 2 points on the line?