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Lucy has decided to start a dog sitting business. She needed 45 dollars in supplies to get her new venture started. She charges 2 dollars for each dog she walks for 20 minutes.

 

Write a linear equation that shows how much money she should expect to make. (Note: The 45 dollars used for supplies takes away from the income of charging 2 dollars per dog walked. Use the fixed costs as - 45 instead if + 45.)

 

a) y = 2x + 45

 

b) y = -2x + 45

 

c) y = -2x - 45

 

d) y = 2x - 45

 Oct 5, 2020
edited by SmartMathMan  Oct 5, 2020
edited by SmartMathMan  Oct 5, 2020
edited by SmartMathMan  Oct 5, 2020
 #1
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This assumes that y represents the money earned and that x represents how many "20min" she has walked. 2x represents the amount she earns every 20min, so we should subtract 45 from that to get y=2x-45. That corresponds to answer choice (d).

 Oct 5, 2020
 #2
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Thank you!

SmartMathMan  Oct 5, 2020

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