Consider the line whose equation is y= -1/5x +3. the slope of any line that is parallel to this is. the slope of any line that is perpendicular to this is.

Parallel lines have the same slope, but different y intercepts.

Perpendicular lines have slopes that multiply to -1 (assuming neither line is vertical). So if m is the perpendicular slope of -1/5, then (-1/5)*m = -1 solves to m = 5. Another way to look at it is to flip the fraction and the sign of -1/5 to get to 5/1 or just 5.

part a: 1.08

part b: 27.59