SOLUTION: Teresa makes an investment at % simple interest. At the end of 1 year, the total value of the investment is . How much did she originally invest?

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Question 658151: Teresa makes an investment at % simple interest. At the end of 1 year, the total value of the investment is . How much did she originally invest?
Answer by chriswen(106) About Me  (Show Source):
You can put this solution on YOUR website!
So you have no numbers. I'm assuming you're using variables then.
Let x be the yearly interest rate.
Let $y be the investment after 1 year.
This is the equation for simple interest for 1 year.
Original Investment*(1+x)=y
So if you have y and want to know the original investment,
Original Investment = y/(1+x)