Answer:
Sub, Compliments
Explanation:
The indifference curve should be drawn in a straight line when the two goods i.e. X and Y are perfect substitutes for each other while on the other hand when the  indifference curve should be drawn in a right triangle when the two goods i.e. X and Y are perfect complements
Therefore as per the given statement, the first line represent the substitutes and the other one represents the compliment
