At tommy's tubes, you can rent a tube to float down the blanco river. a payment of $12.50 allows you to keep the tube for up to 3 hours. after 3 hours, it costs an additional $3.50 per hour. write an equation and solve it to determine the number of hours you could keep a tube for $30.00.

Equation is:

y = 3.50 (x-3) +12.50

Since you can keep the tube for 3 hours for a set price of 12.50 you need to subtract those 3 hours from the variable.

Now solve the following using the equation:

30 = 3.50 (x-3) +12.50
3.50 x - 10.50 +12.50 = 30
3.50 x = 28
x = 8  x represents number of hours. So you can keep the tube 8 hours for $30.00