This one is extremely confusing I’ve worked it out 6 times and still no answer can somebody plz help

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

Alcoa was $10.02 a share yesterday. today it is at $9.75 a share. if you own 50 shares, did ou have capital gain or loss ? how much of a gain or loss did you have ? express the capital gain/loss as a percent of the original price

Ineed here’s a picture of the question