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.

Question

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

Answer 1

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

Answer 2

P=200$Q=85