Note that a. When two lines are parallel, their slopes are equal. b. When two lines are perpendicular, the product of their slopes is -1. c. A vertical line has undefined slope. d. A horizontal line has a slope of zero.
The two slopes are 5 and 1/5. The product of the slopes is 5*(1/5) = 1.
Test the given answers. Neither line is vertical because each line has a defined slope. The lines are not parallel, cause their slopes are not equal. The lines are not perpendicular because the product of their slopes is not equal to -1.
