SOLUTION: Here is my question' A coffee shop sells coffee for $7.60 for a 12-ounce bag and $11.60 for a 20-ounce bag. The store just came out with a 28-ounce bag. What would be a good pri

Algebra ->  Linear-equations -> SOLUTION: Here is my question' A coffee shop sells coffee for $7.60 for a 12-ounce bag and $11.60 for a 20-ounce bag. The store just came out with a 28-ounce bag. What would be a good pri      Log On


   

Question 80727: Here is my question'
A coffee shop sells coffee for $7.60 for a 12-ounce bag and $11.60 for a 20-ounce bag. The store just came out with a 28-ounce bag. What would be a good price for the bag? Solve by making a graph.I need the answer.
I really need this A.S.A.P Thankyou
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
A coffee shop sells coffee for $7.60 for a 12-ounce bag and $11.60 for a 20-ounce bag. The store just came out with a 28-ounce bag. What would be a good price for the bag?
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You are given two points of a linear function: (12,7.6) and (20,11.6)
Find the equation:
m=[11.6-7.6]/[20-12]= 4/8 = 1/2
Find the y intercept: 11.6=(1/2)20+b ; 11.6=10+b; b=1.6
EQUATION: y=(1/2)x+1.6
graph%28400%2C300%2C-5%2C40%2C-1%2C20%2C%281%2F2%29x%2B1.6%29
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Now, solve for y if x = 28
y=(1/2)28+1.6 = $15.60
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Cheers,
Stan H.