Linear Functions · Exercise 72

A farmer finds there is a linear relationship between the number of bean stalks, $n,$ she plants and the yield, $y,$ each plant produces. When she plants 30 stalks, each plant yields 30 oz of beans. When she plants 34 stalks, each plant produces 28 oz of beans. Find a linear relationship in the form $y=mn+b$ that gives the yield when $n$ stalks are planted.

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

OpenStax, Precalculus 2e · §2.1 Linear Functions · Exercise 72