The administrator of Azalea Hills Hospital would like a cost formula linking the administrative costs involved in

admitting patients to the number of patients admitted during a month. The Admitting Department's cost and

the no. of patients admitted during the immediately preceding four months are given in the following table:

	No. of Patients		Admitting
Month	Admitted		Dept. Costs
July	2,100		$15,500
August	1,600		$14,400
September	1,300		$12,600
October	1,400		$13,700

Using the High-low method calculate the amount of the variable a. Cost formula Y = a + bX.