48.49.Find xwhen y5¬0.y5¬2750x110,80005¬2750x110,800750x5¬10,800x<¬14The store will run out of paint after 14 days, sothe manager should order more paint after 14 2 4or 10 days.50.Two points on the line are (120,260) and (130,270).m5¬}((yx2222yx11))}5¬}21730022(212600)}5¬}21100}or21y2y1 5¬m(x2x1)y2(260) 5¬21(x2120)y1605¬2x1120y5¬2x16051.The slope of the Jeff Davis/Reeves County line is 21 (from Exercise 50), so the slope of theReeves/Pecos County line is 1.y2y15¬m(x2x1)y2(260)5¬1(x2120)y1605¬x2120y5¬x218052.The equation y5mxis the special case of y5m(x2x1)1y1when x15y150.53.Sample answer: In the equation of a line, the bvalue indicates the fixed rate, while the mxvalue indicates charges based on usage. Answersshould include the following.• The fee for air time can be considered the slopeof the equation.•We can find where the equations intersect tosee where the plans would be equal.
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This note was uploaded on 12/19/2011 for the course MAC 1140 taught by Professor Dr.zhan during the Fall '10 term at UNF.