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 Topic: piecewise graph
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 A piecewise graph 2014-05-10 From Zoe:Lightning Energy charges residential users for each unit of electrical energy bought from them each quarter, according to the scale below: 0-500 units cost 17 cents per unit 500-1500 units cost \$85 plus 10 cents for each unit in the excess of 500 1500 or more units cost \$185 plus 9 cents for each unit in excess of 1500 Sketch a graph showing the charge C as a function of U for up to 2000 electricity unitsAnswered by Penny Nom. An equation for a line with a changing slope 2009-03-21 From Ben:Is there anyway to write an equation for a line with a changing slope. e.g. A cell [hone company has a initial fee of 50\$ paying for the first 100 minutes, the rate then increases to 10 cents per minute, then at 500 minutes the rate is 5 cents per minute. If so please tell how. ThanksAnswered by Penny Nom.

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