I have a word problem I can't solve. Please help? A Plumber charged $110 for a three-hour job and $160 for a five-hour job. At this rate, how much would he charge for an 8-hour job? Thanks in advance.
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Let a be the initial cost, and b be the cost per hour. Then: a + 3b = 110 a + 5b = 160 Solve the system for a and b; your answer will be a + 8b.
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