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Unformatted text preview: minutes for a at fee of 30 dollars. If your usage exceed 700 minutes, you pay 30 cents for each minute. Let x be the number of minutes you talk and let y be the cost. Then y = 30 + .3(x-700) We want to find out how many minutes each of us would have to use our phones to pay the same amount in one month. We can do that by considering the system of equations y = 20 +.5(x-500) y = 30 = .3(x-700)...
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- Spring '12