Question

Penny’s bank account showed a balance at the beginning of the month of $180. She

spent $2.50 each day on bus tokens. Write an equation representing the amount A left in
her account after d days.

Answer 1

d=180-2.50x I think.

Answer 2

`a=180-2.50d`

Explanation:

If Penny starts with a balance of $180, and
`a` represents the account left in her account after
`d` days. we can start modeling an incomplete equation:

`a=180`

We are then told that she spends $2.50 each (
`d`) day. This can be represented as:

`2.50d`

Let's now include the expression into the incomplete equation. Remember that since she is spending, the
`2.50d` will be subtracted from her balance of $180:

`a=180-2.50d`