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Math·Algebra·Linear equations in two variables

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A city has an area of $x\text{ square miles}$ and a population density of $1,035\text{ people per square mile}$. The suburb adjacent to the city has an area of $y\text{ square miles}$ and a population density of $535\text{ people per square mile}$. The combined population of the city and the suburb adjacent to the city is $13,165\text{ people}$. Which equation represents this situation?

A

$1,035x+535y=13,165$

B

$1,035x+535=13,165y$

C

$1,035x+535=1,570y$

D

$1,035x+535y=1,570$