Mathematics
LewisFilkins178
2

Joe has been keeping track of his cellular phone bills for the last two months. The bill for the first mont was $38.00 for 100 minutes of usage. The bill for the second month was $45.50 for 150 minutes of usage. Find a linear equation that gives the total monthly bill based on the minutes of usage

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(1) Answers
Janae

The problem here is that you need to find what is the monthly fee for the telephone + the fee per minute. Data we are looking for: x - subscription plan y - rate per minute 1. Finding the monthly fee (x) + rate per minute (y) x + 150y = 45.50 x + 100y = 38.00 you have to deduct those equatations (x - x = 0, 150y - 100y = 50y, 45.5 - 38 = 7.5) - finding rate per minute: 50y = 7.50 5y = 0.75 y = 0.15 - finding monthly fee x + 150 *0.15 = 45.50 x = 45.50 - 22.50 x = 23.00 Looking at the data above you can see that no matter for how many minutes you use your phone you have to pay 23$. For every minute you spend talking the fee is 0.15$ That is why (z) the total amount you have to pay consist of 23 (subscription) + 0.15y (15c per minute): z = 23 + 0.15y Add a comment if sth is not clear

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