User: desconectar
Maths Exercices

Slope of parallel and perpendicular lines

Parallel lines have the same slope.
Perpendicular lines have slopes that are opposite reciprocals, like and . The slopes also have a product of -1.

Line t has a slope of . Line u has a slope of . Are line t and line u parallel or perpendicular?

The lines are not parallel because and are not equal.

The lines are perpendicular because and are opposite reciprocal:

Take the slope of line t
Find the reciprocal
Find the opposite

Yes, and are opposite reciprocals.

So, the lines are perpendicular.

Line u has a slope of . Line i has a slope of . Are line u and i parallel or perpendicular?