SOLUTION: The Rocket Coaster has 15 cars, some that hold 4 people some that hold 6 people. There is room for 72 people altogether. How many 4 passenger cars are there? How many 6 passenger

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: The Rocket Coaster has 15 cars, some that hold 4 people some that hold 6 people. There is room for 72 people altogether. How many 4 passenger cars are there? How many 6 passenger      Log On


   

Question 273799: The Rocket Coaster has 15 cars, some that hold 4 people some that hold 6 people. There is room for 72 people altogether. How many 4 passenger cars are there? How many 6 passenger cars are there?
Answer by JBarnum(2146) About Me  (Show Source):
You can put this solution on YOUR website!
a=how many 4 passanger carts there are
b=how many 6 passanger carts there are
a%2Bb=15a=15-b
4a%2B6b=72uses substitution
4%2815-b%29%2B6b=72
60-4b%2B6b=72
60%2B2b=72
2b=12
b=6
a=15-b
a=15-6
a=9
theres highlight%289%294-passanger carts
theres highlight%286%296-passanger carts