State your variables and what they represent. write a linear function describing the situation. use the function to solve the problem. a phone costs $8 per month, plus 10 cents per message unit. how much is the monthly bill if 40 message units are used?

y = 0.10x + 8, $12

Step-by-step explanation:

y = monthly bill

x = number of message units

Each message unit costs $0.10, so the cost of x message units is 0.10x.  The phone adds $8 to the monthly bill.  Therefore:

y = 0.10x + 8

If x = 40, then:

y = 0.10 (40) + 8

y = 4 + 8

y = 12

The monthly bill is $12.

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step-by-step explanation:

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