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 \( 34 \) oz of beans. When she plants \( 36 \) stalks, each plant produces \( 32 \) oz of beans. Find a linear relationship in the form
\( y = m n + b \) that gives the yield when \( n \) stalks are planted.