Which statement is true for all parallel lines?

a. Parallel lines have slopes that are undefined
b. Parallel lines have a slope of zero
c. Parallel lines have the same slope
d. Parallel lines have slopes that are negative reciprocals of each other

1 answer

The correct statement for all parallel lines is:

c. Parallel lines have the same slope.

Parallel lines maintain a constant distance apart and never intersect, which means they must have identical slopes.