Required information [The following information applies to the questions displayed below.] Phillips Company manufactures air-conditioning units for commercial buildings and has noticed considerable variation in shipping expenses from month to month as per the data below: Total Units Shipping Month Shipped Expense January 4 $2,200 February $3, 100 March $2, 600 April $1, 290 OOO WNUID May $2, 190 June $3, 000 July $4,320 4. What is the cost formula for shipping expenses? Y = + X