anonymous
  • anonymous
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?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
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
anonymous
  • anonymous
@campbell_st , @Nnesha
anonymous
  • anonymous
@jim_thompson5910

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jim_thompson5910
  • jim_thompson5910
First off, what are the two points?
anonymous
  • anonymous
Idk
anonymous
  • anonymous
Points: (# of minutes, cost). You have 2 pairs of minutes and costs. Try to write the points with them
jim_thompson5910
  • jim_thompson5910
Exactly. So for example, if it says "50 minutes cost $35" then that would translate into the ordered pair (50, 35).
anonymous
  • anonymous
oh okay @jim_thompson5910
jim_thompson5910
  • jim_thompson5910
so based on that example and what peachpi said, what are the two ordered pairs in this case?
anonymous
  • anonymous
the two ordered pairs are (135,100) and (375,500)
jim_thompson5910
  • jim_thompson5910
unfortunately you mixed up the cost and minutes
jim_thompson5910
  • jim_thompson5910
"The company charges $135 for 100 minutes" means x = 100 y = 135 x is the minutes y is the cost
jim_thompson5910
  • jim_thompson5910
so "The company charges $135 for 100 minutes" is the ordered pair (100,135)
anonymous
  • anonymous
oh okay
jim_thompson5910
  • jim_thompson5910
what is the other point?
anonymous
  • anonymous
(500,375)
jim_thompson5910
  • jim_thompson5910
good
jim_thompson5910
  • jim_thompson5910
so we have (100,135) and (500,375)
jim_thompson5910
  • jim_thompson5910
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)
anonymous
  • anonymous
|dw:1434346947472:dw|
anonymous
  • anonymous
Then I got the answer 0.6
jim_thompson5910
  • jim_thompson5910
I'm getting the same thing too
jim_thompson5910
  • jim_thompson5910
so the slope is m = 0.6
anonymous
  • anonymous
okay thanks!
jim_thompson5910
  • jim_thompson5910
you're welcome
anonymous
  • anonymous
Can you help with another please?
jim_thompson5910
  • jim_thompson5910
sure
anonymous
  • anonymous
I'll tag you

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