Posted by **Kirk** on Sunday, July 24, 2011 at 4:11pm.

Suppose you have a cookie stand, and when you charge $3 per cookie box you sell 200 boxes. But when you raise your price to $4 you only sell 120 boxes. Write the equation for the number of boxes you sell as a function of the price you charge. Denote "b" for the number of boxes, and "p" for prices you charge, assume the function is linear.

- MAT101 -
**Damon**, Sunday, July 24, 2011 at 4:52pm
b = k p + c where k and c are constants

200 = k (3) + c

120 = k (4) + c

------------------subtract

80 = -1 k

so

k = -80

back to first eqn

200 = -80(3) + c

200 = -240 + c

c = 440

so

b = -80 p + 440

- MAT101 -
**Kirk**, Sunday, July 24, 2011 at 5:22pm
Thank you, I was stuck on this for several hours to how to write this out, thank you again!

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