A movie rental website charges $5.00 per month for membership and $1.25 per movie. How many movies did Andrew rent this month if this month's bill was $16.25?
Let N be the number he rented
Then we have that....
Variable cost + Fixed Cost = Total Cost ....so.....
1.25N + 5.00 = 16.25 subtract 5.00 from each side
1.25N = 11.25 divide both sides by 1.25
N = 9
He rented 9 movies
