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Linear relationship word problems: advanced

Problem

P=23+10(h1)
People start waiting in line for the release of the newest cell phone at 5 a.m. The equation gives the number of people, P, in line between the hours, h, of 6 a.m. and 11 a.m., when the doors open. Assume that 6 a.m. is when time h=1. What does the 23 mean in the equation?
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