I'm in depression..!!

Which of the following graphs represents the function f(x) = 2^x

Which approach to the theory-and-research cycle does the following sequence reflect: (1) specific observations suggest generalizations, (2) generalizations produce a tentative theory, (3) the theory is tested through the formation of hypotheses, and (4) hypotheses may provide suggestions for additional observations?

Find the slope and the y-intercept if there's one and the equation of the line given these two points( 3, 2) and( 3, -4)