Suppose a consumer has $900 to spend on two goods, Good X and Good Y. The price of Good X is given by Px = $18. The price of Good Y is given by Py = $20. a) Write the equation for the consumer's budget constraint. b) Graph the consumer's budget constraint. Put the quantity of Good X on the horizontal axis, and the quantity of Good Y on the vertical axis. Be sure to label your graph carefully and accurately. c) Calculate the MRT