Question

20) What is the slope of the line that is perpendicular to the line of the given equation?

Answer 1

Perpendicular lines have slopes that are opposite signs and reciprocals.
Example: If one line has a slope of 5/3, then the perpendicular slope is -3/5.

In your case, your first line has a slope of -1/5. The perpendicular slope will be positive and will be 5/1.

The slope of a line perpendicular to the given one is 5.