Question

If AB is parallel to CD and the slope of AB is -3, what is the slope of CD?

Answer 1

in order for linear functions to be parallel, the slope needs to be the same, so the slope of CD has to be -3

Answer 2

It should be -3 as well, if there parallel they are equal, parallel lines have equal slopes. Since the slope of AB is -3 and CD is parallel to AB then CD has a slope of -3.