Melanie charges $4.50 per hour when she washes cars, plus $5.00 for supplies. Which function rule represents the amount, (Y), Melanie charges to wash cars for (x) hours.

A: y=8.50x
B: y=4.50x+5.00
C: y=5.00x+450
D: y=9.50x

B: y=4.50x+5.00 (since Melanie charges $4.50 per hour plus a flat fee of $5.00 for supplies)

The correct function rule that represents the amount Melanie charges to wash cars for x hours is B: y=4.50x+5.00.