Linear Functions · Exercise 128

A clothing business finds there is a linear relationship between the number of shirts, $n,$ it can sell and the price, $p,$ it can charge per shirt. In particular, historical data shows that 1,000 shirts can be sold at a price of \ 30, while 3,000 shirts can be sold at a price of \22. Find a linear equation in the form $p\left(n\right)=mn+b$ that gives the price $p$ they can charge for $n$ shirts.

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Algebra and Trigonometry 2e · §4.1 Linear Functions · Exercise 128