You are preparing to study the social media habits of high school students. Describe two categorical variables and two quantitative variables that you might record for each student

In order for the function to be linear, what must m be and why? m = 22 because the rate of change is 1. m = 20 because the rate of change is 3. m = 22 because the rate of change is -1. m = 20 because the rate of change is -3.