A Test of Your Intuition We have two curves. The first starts at y(0) = 1 and its rate of increase equals its height: that is, it satisfies y' = y. The second curve also starts at y(0) = I with the same slope, and its second derivative, measuring upward curvature. equals its height; that is it satisfies y" = y. Which curve lies above the other? Make an educated guess before resolving the question analytically.