Reflexive property of Equality is your answer!
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100 dollars should be a one time fee so that has to be added to the equation, and since it is a one time fee it should not have a variable next to it.
It also says that you have to pay 720 dollars per month, so it has to have a variable next to it to show the number of months that she needs to pay that amount of money.
The answer should be D.
y= 720x +100
It would be from 0 < x < 4 as the question is basically asking when is the function below the y value of 0, so below the x-axis
