Question

The cost of a service call to fix a washing machine can be expressed by the linear function y = 45 x + 35, where y represents the total cost and x represents the number of hours it takes to fix the machine. What does the slope represent?

The cost for each hour it takes to repair the machine.

The cost for coming to look at the machine.

The total cost for fixing the washing machine.

The amount of time that it takes to arrive at the home to make the repairs.

Answer 1

• A) The cost for each hour it takes to repair the machine.

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The total cost of repair is expressed by the function:

• y = 45x + 35

As we see,

• y- is the total cost, x - is the number of hours to fix;

• The slope is 45 and it represents the cost per hour to fix the car;

• The 35 is the y-intercept that represents a one off cost for service.

Therefore the answer is option A.