a.
Since and are both greater than zero, the assumption that more is better satisfied for both goods.
b.
. Hence marginal utility of remains constant as the consumer buys more .
c.
MRSxy is the amount of consumer is willing to give for marginal unit of , so that their utility remains the same.
d.
Hence is constant along an indifference curve.
e.
From the above graph with x on the horizontal axis and y on the vertical axis, we can see that the indifference curve is touching both axis, and as indifference curve is a straight line. Hence MRS is a constant well known as a perfect substitution.
f.
Both and are parallel hence they intersect both axes.
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