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A telephone call costs $0.15 for the first minute, plus $0.05 for each additional minute. The total cost of the call was $1.30. This equation can be used to find m, the length in minutes of the telephone
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A telephone call costs $0.15 for the first minute, plus $0.05 for each

additional minute. The total cost of the call was $1.30. This equation
can be used to find m, the length in minutes of the telephone call.
0.15 + 0.05(m - 1) = 1.30

User Laridzhang
by
3.3k points

1 Answer

4 votes
Subtract .15 from both sides...
.05(m-1) = 1.15
Divide both sides by .05...
m-1 = 23
Add 1 to both sides...
m = 24
There’s your answer, the call was 24 minutes long
User Asaf Chertkoff
by
3.7k points
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