Question

Given the equations of two lines, explain how you determine whether the two lines are parallel or perpendicular or neither. Use 3 examples (one of each type) in your response.

Answer 1

dot product of direction vectors could apply

Answer 2

or if you are working with slopes in R^2, then:

parallel: slopes are the same

perpendicular: slopes are negative reciprocals

otherwise, neither

Answer 3

So what about examples? My book doesn't have any...