Judy purchases boxes of cereal at dollars per box. The total cost () is proportional to the number of boxes she buys. If there is a fee () on the whole purchase, which equation expresses the relationship between her total cost and the number of boxes she buys?
A
B
C
D
The total cost () is proportional to the number of boxes she buys. Let's represent the number of boxes she buys as . We can write the equation as:
() =
Since there is a fee () on the whole purchase, we need to add that to the equation. We can further write the equation as:
() = +
Therefore, the correct answer is option:
C