If s represents the number of songs Kim downloads, her expenses for a month must satisfy the inequality 5.00 + 0.58·s ≤ 13.00
To solve this, subtract 5.00 to get the s-term by itself, then divide by the coefficient of s. 0.58·s ≤ 8.00 s ≤ 8.00/0.58 ≈ 13.79 The number of songs must be an integer, so we conclude Kim can download 13 songs, but not 14 songs.
Kim can download 13 songs without exceeding her budget.
A function is a relation for which each value from the set the first components of the ordered pairs is associated with exactly one value from the set of second components of the ordered pair.