hey

[humakhan]

Find the slope of a line parallel to the line passing through the points:
(-4,0) and (1,-5)

the slope is (5,-5) right?

_______________________________________________________________find the slope of a line perpendicular to the line passing through the points:
(-1,4) and (8,1)

the slope is (9,-3) right?

 

[Guest]

Correct your slope calculation as per your earlier posting, then....

perpendicular lines have slopes that multiply together to give -1

ie

(slope 1) x (slope 2) = -1 then these 2 lines are perpendicular

 

[humakhan]

hey thanks