Using the high low method, estimate a cost formula for custodial supplies-expense.Y=. +. X

The Lakeshore Hotel's occupancy-days and custodial supplies expense over the last seven months were as follows: Custodial Occupancy- Supplies Month Days Expense March 19, 000 $ 15 , 260 April 13, 300 15, 340 May 16, 200 15, 840 June 31, 500 18,900 July 30, 000 22, 700 August 20, 800 17, 670 September 16, 500 16 , 650 Occupancy-days are a measure of the overall activity at the hotel. For example, when a guest stays at the hotel for three days, it is counted as three occupancy-days