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anonymous

  • one year ago

A telephone company charges a fixed monthly rate plus a rate per minute of usage. The company charges $135 for 100 minutes of usage and $375 for 500 minutes of usage. An equation can be written to show the relationship between the total minutes used (x) and the total monthly charges (y). Which of the following best describes the steps to draw the graph of y against x?

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  1. anonymous
    • one year ago
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    Draw a graph which joins the points (135, 100) and (375, 500) and has a slope = 0.6 Draw a graph which joins the points (100, 135) and (500, 375) and has a slope = 0.6 Draw a graph which joins the points (100, 135) and (500, 375) and has a slope = 1.67 Draw a graph which joins the points (135, 100) and (375, 500) and has a slope = 1.67

  2. anonymous
    • one year ago
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    @campbell_st , @Nnesha

  3. anonymous
    • one year ago
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    @jim_thompson5910

  4. jim_thompson5910
    • one year ago
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    First off, what are the two points?

  5. anonymous
    • one year ago
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    Idk

  6. anonymous
    • one year ago
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    Points: (# of minutes, cost). You have 2 pairs of minutes and costs. Try to write the points with them

  7. jim_thompson5910
    • one year ago
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    Exactly. So for example, if it says "50 minutes cost $35" then that would translate into the ordered pair (50, 35).

  8. anonymous
    • one year ago
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    oh okay @jim_thompson5910

  9. jim_thompson5910
    • one year ago
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    so based on that example and what peachpi said, what are the two ordered pairs in this case?

  10. anonymous
    • one year ago
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    the two ordered pairs are (135,100) and (375,500)

  11. jim_thompson5910
    • one year ago
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    unfortunately you mixed up the cost and minutes

  12. jim_thompson5910
    • one year ago
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    "The company charges $135 for 100 minutes" means x = 100 y = 135 x is the minutes y is the cost

  13. jim_thompson5910
    • one year ago
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    so "The company charges $135 for 100 minutes" is the ordered pair (100,135)

  14. anonymous
    • one year ago
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    oh okay

  15. jim_thompson5910
    • one year ago
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    what is the other point?

  16. anonymous
    • one year ago
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    (500,375)

  17. jim_thompson5910
    • one year ago
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    good

  18. jim_thompson5910
    • one year ago
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    so we have (100,135) and (500,375)

  19. jim_thompson5910
    • one year ago
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    use the slope formula \[\Large m = \frac{y_{2}-y_{1}}{x_{2}-x_{1}}\] to find the slope of the line through the two points (100,135) and (500,375)

  20. anonymous
    • one year ago
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    |dw:1434346947472:dw|

  21. anonymous
    • one year ago
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    Then I got the answer 0.6

  22. jim_thompson5910
    • one year ago
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    I'm getting the same thing too

  23. jim_thompson5910
    • one year ago
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    so the slope is m = 0.6

  24. anonymous
    • one year ago
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    okay thanks!

  25. jim_thompson5910
    • one year ago
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    you're welcome

  26. anonymous
    • one year ago
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    Can you help with another please?

  27. jim_thompson5910
    • one year ago
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    sure

  28. anonymous
    • one year ago
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    I'll tag you

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