Posted by **Cayla** on Thursday, February 2, 2012 at 12:40pm.

You are a manufacturer of a certain item. You’ve calculated that you can sell 80 of these items for $5 each and you can sell 60 of these items for $8 each.

Assuming this relationship is linear, write an equation that relates cost to the number of watches you make

- math -
**Steve**, Thursday, February 2, 2012 at 3:26pm
Let p be the price, and N be the sales

If there's a linear relationship,

N = mp + b

Now plug in what you know:

80 = 5m + b

60 = 8m + b

20 = -3m

m = -20/3

b = 340/3

so,

3N = -20p + 340

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