Question

A new freezer costs $500 plus $0.20 a day to operate. An old freezer cots $20 plus $0.50 a day to operate. After how many days in the cost of operating each freezer equal? Solve by using row reduction

Answer 1

First we write equation for new freezer where x will be number of days operated and than equation for second freezer where x will have same function and we set those 2 equations to be equal. after that all we need to do is to solve for x

500 + 0.2*x = 20 + 0.5*x
480 = 0.3*x
x = 480/0.3 = 1600

The answer is 1600 days