Javier had $305 in his bank account. His bank charges a fee of $7.50 each month that a balance is below $500. If he makes no other deposits or withdrawals, how much money is in Javier’s account at the end of three months?
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Javier’s account has $282.5 at the end of the three months.

Step-by-step explanation:

final = initial - 7.5x

initial is the initial amount of money in the account, so 305. x is the number of months that have passed. Since Javier doesn't deposit any more money durning that time, the amount in the bank will always be less then 500 we don't have to consider anything else. We just sub initial with 305 and x ( the number of months) with 3 to get the answer. So,

final = 305 - 7.5 * 3 = 282.5

thats not a system of equations, that is a solution