The slopes of two lines are 5 and 1/5. because of this, we can conclude that these two lines are which of the following?
vertical
none of these
parallel
perpendicular

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.

None of these

21/2 or 5/2