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Brian sat in a massage chair at a shopping mall for 8 minutes and paid $9. Norah sat in the same massage chair for 12 minutes and paid $11. If the relationship between the number of minutes and the amount paid is linear, with x representing the amount paid in dollars, which of these equations models this situation?

Guest Mar 9, 2017
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y= mx + b

 

two data points  $ 9,8    and  $11,12

m = 8-12  /  9-11   = -4/-2 = 2

 

y = 2x + b   

8 = 2(9) + b    b = -10

 

y = 2x -10      where x = dollars and y is minutes              

ElectricPavlov  Mar 9, 2017

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