Question

Maria is comparing the prices of two window cleaning companies. Company A charges $6 per window and an additional $12 as service charges. Company B charges $5 per window and an additional $15 as service charges.
Part A: Write equations to represent Company A's and Company B's total charges for cleaning a certain number of windows. Define the variable used in the equations. (4 points)

Part B: Which company would charge less for cleaning 8 windows? Justify your answer. (3 points)

Part C: How much money is saved by using the services of Company B instead of Company A to clean 6 windows? (3 points)

Answer 1

Part A
y=6x+12
y=5x+15
x is the amount of windows, y is the total amount of money 
Part B
y=6(8)+12       =60
y=5(8)+15      =52
Company B 
Part C
y=6(6)+12       =48
y=5(6)+12       =42
$6 is saved