Question 118790
SLOPES OF THESE TWO LINES CONNECTING THESE POINTS WILL TELL THE STORY:
(6-3)/(11-2)=3/9=1/3 FOR THE FIRST SLOPE.
(18-3)/(-3-2)=15/-5=-3 FOR THE SECOND SLOPE.
SEEING AS THESE TWO SLOPES ARE NEGATIVE RECIPRICALS OF EACH OTHER THAT SAYS THAT THESE LINES ARE PERPENDICULAR.