I need help on number 1

How can you tell when x and y are not directly proportional?

Rewrite so the subject can be y in the formula d=m-y/y+n

Describe the end behavior of the function below. f(x)=(2/3)^x-2 a. as x increases, f(x) approaches infinity. b. as x decreases, f(x) approaches 2. c. as x increases, f(x) approaches -2. d. as x decreases, f(x) approaches negative infinity.