A video rental company charges a membership fee of $10 plus $5.50 for each movie rented. If the slope of the function were to decrease, how would that effect the price of renting a movie?

I got no but correct me if I'm wrong correct me!! If it is no how would it be?

C = mx + b

C = 5.5x + 10.

The slope = 5.5. So the cost would decrease.