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Mary is putting money into a checking account. Let y represent the total amount of money in the account (in dollars). Let x represent the number of weeks Mary has been adding money. Suppose that x and y are related by the equation =+75030xy . Answer the questions below. Note that a change can be an increase or a decrease. For an increase, use a positive number. For a decrease, use a negative number.

What is the change per week in the amount of the account?

what was the starting amount money in the account?

Answer :

obviouslygelb
So mary is putting 30 dollars a week into a savings account. The y-intercept is 750 which means that before she started putting money she had 750 dollars. 

The change per week is 30 dollars increase.
The starting amount is 750 dollars.

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