Rate of change

I have some questions that I would like you to check please. Thanxs!

Find the slope then describe what it means in terms of the rate of change of the dependent variable per unit change in the independent variable.

1. The linear function f(x)=4.6x+37 represents the percentage of people, f(x), who graduated from college x years after 1998.

I got: m=4.6; the percentage of people graduating from college has increased at a rate of 4.6% per year after 1998.

2. The linear function f(x)=-9.9x+26 models the percentage of people, f(x), who eat at fast food resturants each week x years after 1998.

I got: m=-9.9; the percentage of people eating at fast food resturants each week has decreased at a rate of -9.9% per year after 1998.

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