A text messaging plan charges a flat fee of $5 per month for up to 100 text messages sent plus $0.25 for each additional text message sent that month. Which of the following graphs represents the cost, y, of sending x texts in a month?

Explanation

Choice A is correct. The text messaging plan charges a flat fee of $5 per month for up to 100 text messages. This is represented graphically with a constant value of y = 5 for 0 ≤ x ≤ 100. After 100 messages, each additional message sent costs $0.25. This is represented graphically with an increase of 0.25 on the y-axis for every increase of 1 on the x-axis. Choice A matches these descriptions.