Each day that a library book is kept past its due date, a 0 point 3 0 dollars fee is charged at midnight. Which ordered pair is a viable solution if x represents the number of days that a library book is late and y represents the total fee?

The total fee is $0.30 times the number of days late, so y = 0.30x. For 8 days, the fee is 0.30 × 8 = $2.40, giving the ordered pair (8, 2.40). The other choices either use a negative number of days or a non-whole number of days late.

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