I need help understanding how to do the following problem regarding microeconomics and indifference curves

Question

I need help understanding how to do the following problem regarding microeconomics and indifference curves:

(1) For the following utility functions sketch indifference curves for all of them and give the equation of the indifference curves corresponding to utility level k when possible (this is when you can express x2 as a function of x1).

(a) u(x1,x2) = min{x + 3y,max{2x,x + y}}

Microeconomics