Andre's has a cell phone with a local telephone company. His bill is determined each month by a $39.99 flat fee plus $0.20 for each text message sent or received. (See Example 3.)
a. Write a linear model to compute the monthly cost y, of Andres cell phone bill if x text messages are sent or received.
b. Use the equation to compute Andreas cell phone bill for a month in which he sent or received a total of 40 text message.
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