The table show the temperature of a greenhouse where the temperature was taken When these data are graphed on a coordinate grid, the points all lie on the same line. What are the slope and the y-intercept of this line?

A) slope = -2, y-intercept = 40

B) slope = 2, y-intercept = 40

C) slope = -5, y-intercept = 30

D) slope = 5, y-intercept = 30