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Oceanside Bike Rental Shop charges 14 dollars plus 2 dollars an
hour for renting a bike. Sam paid 38 dollars to rent a bike. How
many hours did he pay to have the bike checked out?


Sagot :

This is a linear equation.
y = mx+b
y is the total cost.
The slope m is the rate: that's 9 dollars per hour.
x is the number of hours.
b is the initial value: that's 16 dollars.
y = 9x+16

The problem states that the cost was 79 dollars.
Substitute that for y and solve for x.
79 = 9x+16
63 = 9x
x = 7 hours