Solve the Problem. -Suppose That a Sales Person Observes That If an Item

Multiple Choice

Solve the problem.
-Suppose that a sales person observes that if an item is priced at $8 per item then 10 items are sold. Find a linear function f(x) = mx + b whose input is the number of hours that the plumber works
And whose output is the corresponding cost for the house call. If 8 items are sold for $10 per item
Then use the function to model the number y of items sold for x dollars per item.

A) f(x) = x + 18
B) f(x) = -x + 18
C) f(x) = x + 2
D) f(x) = -x + 2