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 \( 17000 \) shirts can be sold at a price of \( \$ 63 \) , while \( 18000 \) shirts can be sold at a price of \( \$ 61 \) . Give a linear equation in the form \( p = m n + b \) that gives the price \( p \) they can charge for \( n \) shirts. 

Answer: \( p = ?\) 

Round the value of your slope to three decimal places. Make sure to use the correct variable in your answer.