SOLUTION: how to decide whether the lines given are parallel, perpendicular or neither The line through (7,1) and (9,3) The line through (6,4) and (4,6)

Algebra ->  Graphs -> SOLUTION: how to decide whether the lines given are parallel, perpendicular or neither The line through (7,1) and (9,3) The line through (6,4) and (4,6)       Log On


   

Question 628278: how to decide whether the lines given are parallel, perpendicular or neither
The line through (7,1) and (9,3)
The line through (6,4) and (4,6)
Answer by reviewermath(1029) About Me  (Show Source):
You can put this solution on YOUR website!
The slope of the line joining (7,1) and (9,3) is %283-1%29%2F%289-7%29+=+1
The slope of the line joining (6,4) and (4,6) is %286-4%29%2F%284-6%29+=+-1
They are perpendicular because the product of the slopes is equal to -1.
The answer is perpendicular.