Question:

Determine if the lines passing through the given pairs of points are parallel, perpendicular or intersect obliquely.

(a) , and ,

(b) , and ,

Attempt:

(a)

Slope of : ,

Slope of : ,

The lines are perpendicular to each other. We can prove it by using .

(b)

Slope of : ,

Slope of : ,

It is an intersect obliquely.

Are my answers correct?