Practice problem
Which of the following properties are true about any two perpendicular lines?
They have the same slope.
Their slopes multiply to 111.
Their slopes multiply to −1-1−1.
They have the same xxx-intercept.
They have the same yyy-intercept.
They never intersect.
They always intersect.
They intersect at a right angle.
Type a concept, like “slope” or “photosynthesis”.