Suppose That a Consumer Has the Utility Function $\mathrm { U } = 5 \mathrm { X } + 7 \mathrm { Y }$

Multiple Choice

Suppose that a consumer has the utility function $\mathrm { U } = 5 \mathrm { X } + 7 \mathrm { Y }$ . The $\mathrm { MRSx } , \mathrm { y }$ is:

A) $7 / 5$
B) $5 / 7$
C) $1.00$ since $\mathrm { X }$ and $\mathrm { Y }$ are perfect substitutes.
D) 0 since $\mathrm { X }$ and $\mathrm { Y }$ are perfect complements.