Pre-Calculus Homework Solutions 61

# Pre-Calculus Homework Solutions 61 - 13 90 x 77 2000 Page...

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13 5 ¬ } x 9 2 0 2 20 7 0 7 0 } 13 ( x 2 2000) 5 ¬ 13 x 2 2000 5 ¬ 1 x 5 ¬ 2001 90% of classrooms will have Internet access in 2001. 46. No; the graph can only rise until it reaches 100%. 47. The y -intercept can be found by setting the equation for x equal to zero, solving for t ,then using this value in the equation for y. x 5 ¬ 5 1 2 t 0 5 ¬ 5 1 2 t 2 5 5 ¬ 2 t 2 } 5 2 } 5 ¬ t y 5 ¬ 2 3 1 t y 5 ¬ 2 3 1 1 2 } 5 2 } 2 y 5 ¬ 2 } 1 2 1 } Find the x -intercept in a similar manner. y 5 ¬ 2 3 1 t 0 5 ¬ 2 3 1 t 3 5 ¬ t x 5 ¬ 5 1 2 t x 5 ¬ 5 1 2(3) x 5 ¬ 11 So two points on the line are (0, 2 } 1 2 1 } ) and (11, 0). m 5 ¬ } ( ( y x 2 2 2 2 y x 1 1 ) ) } 5 ¬ 5 ¬ or } 1 2 } The slope-intercept form of the equation of the line is y 5 } 1 2 } x 2 } 1 2 1 } . 48. Sample answer: Slope is used when driving through hills to determine how fast to go. Answers should include the following. •Drivers should be notified of the grade so that they can adjust their speed accordingly. A positive slope indicates that the driver must speed up, while a negative slope indicates that the driver should slow down.
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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.

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