What is the slope of a line that passes thorough points (3,5) and (8,7)

Pls! does anybody know a shortcut for answering these types of questions in the future?

1.based of the diagrams what is the the value of x? 2.how would you verify your answer for x

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.