Solve part a and part b

Solve the system of equations. y= 2x y= x^2 - 15

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.

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.