1. For the following utility functions, draw a graph of two indifference curves with x on the
horizontal axis and y on the vertical axis, corresponding to $u(x, y) = 2$ and $u(x, y) = 4$.
Label all relevant points.
a. $u(x, y) = 3x + 5y$
b. $u(x, y) = y + \sqrt{x}$