The functions you are looking at are utility functions - they tell you how much utility (happiness) the consumer gets from a given combination of goods x and y.
In order to draw an indifference curve in x,y space you need to know how much of good y is required for a given quantity of good x in order to achieve a fixed level of utility. An indifference curve is just a line joining up all the different combinations of x and y which give you some specified utility outcome.
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