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for her phone service, Ann pays a monthly fee of $13, and she pays a ln additional $0.06 per minute of use. the least she has been charged in a month is $77.68what are the possible number of minutes she has used her phone in a month?use m for the number of minutes and solve your inequality for m.

Sagot :

First we have to write a general equation for the cost she has been charge so it will be:

[tex]y=13+0.06\cdot m[/tex]

then if she paid 77.68 then we can teplace that and solve for m so:

[tex]\begin{gathered} 77.68=13+0.06\cdot m \\ 77.68-13=0.06\cdot m \\ \frac{64.68}{0.06}=m \\ 1078=m \end{gathered}[/tex]

so she use exactly 1078 minutes

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