For each of the following utility functions, find the marginal rate of substitution function, MRS, and plot the indifference curve for which the consumer reaches a utility level of U = 10.
a. u(x1x2)= x1x2
B. u(x1x2)= 2x2
C. u(x1x2)= x1+x2
D. u(x1x2)= min{x1,2x2}
E. u(x1x2)= x2+x21