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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 minutes and y representing the amount paid in dollars, which equation models this situation?

Guest Nov 14, 2018
 #2
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Don't see an equation but we can model the situation

 

We have the points  (8, 9)  and  ( 12,11)

 

The slope between these points is   [ 11- 9 ] / [ 12- 8]  =  2/ 4   =  1/2

 

So....using the point  (8,9)  and the slope, we have

 

y =  (1/2)(x - 8) + 9

 

y  = (1/2)x - 4 + 9

 

y  = (1/2)x +  5

 

 

cool cool cool

CPhill  Nov 14, 2018

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