I don’t understand this question

The physical fitness of an athlete is often measured by how much oxygen the athlete takes in (which is recorded in milliliters per kilogram, ml/kg). the mean maximum oxygen uptake for elite athletes has been found to be 60 with a standard deviation of 7.2. assume that the distribution is approximately normal.

Find the slope of the line that contains the following points. r(-2, 4), s(6, -2)

What is the reflection image of (5,-3) across the line y = -x?