Question 91350
Find the slope through (9,2) and (3,-8)

*[invoke slope 9, 2, 3, -8]



Find the slope through (-3,5) and (5,-1)

*[invoke slope -3,5,5,-1]


Since these two slopes are not equal, they are not parallel. Now multiply the two slopes


{{{(5/3)(-3/4)=-15/12=-5/4}}}


Since this product doesn't equal -1, the two slopes are not perpendicular.