How do I solve this problem?

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when grace and tony started their jobs their weekly salaries totaled $1300. Ten years later grace's salary has doubled and tonys salary has tripled.  Together their weekly salaries now total $3200. How much did they each make 10 years ago?

Sep 10th, 2015

Thank you for the opportunity to help you with your question! Hope your day is going well!

Step 1

Let's write down what we do know.

Grace's salary and Tony's salary equaled 1300

Let's arbitrarily call Grace's salary x, and Tony's salary y.

Then x +y=1300.

Next, we know that Grace's salary doubled, and Tony's salary tripled

Thus 2x+3y=?

Well the mystery is 3200, because that is what it listed



Step 2: System of equations



(We need to have a common coeffient, so that when we subtract the two equations we are left with one variable.    Let's multiply equation 2 by 2, and solve for y)


2x+2y=2600   (Subtract the two equations)



Thus Tony's salary was 1000. Now lets find Grace's by substituting it into the first equation



Thus Grace's salary was 300.


Grace's salary was $300 dollars, and Tony's was $1000.

Notice if you wanted to check, substitute both salaries into the second equation

2(300)+3(1000) =3600

Which is the correct amount!                                       .

Please let me know if you need any clarification. I'm always happy to answer your questions. Leave a positive review if you are happy!
Sep 10th, 2015

thank you! Your work was very detailed and helpful

Sep 10th, 2015

I'm glad I could help!

Sep 10th, 2015

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