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# Algebra Equations watch

1. I have a little question regarding a maths problem.

Re-arranging formula is something I have always had difficulty with. Would someone be able to show me how to accomplish the following?

If I had the following formula;

a = xy / x + y

But I wanted to make y the subject, how could I go about re-arranging that to get the desired outcome?
2. (Original post by Leebertine)
I have a little question regarding a maths problem.

Re-arranging formula is something I have always had difficulty with. Would someone be able to show me how to accomplish the following?

If I had the following formula;

a = xy / x + y

But I wanted to make y the subject, how could I go about re-arranging that to get the desired outcome?
Take out a common factor of y and divide through by the bracket i.e. factorise y and divide by the factorisation
3. (Original post by Leebertine)
I have a little question regarding a maths problem.

Re-arranging formula is something I have always had difficulty with. Would someone be able to show me how to accomplish the following?

If I had the following formula;

a = xy / x + y

But I wanted to make y the subject, how could I go about re-arranging that to get the desired outcome?
Multiply through by the denominator and expand. Get the y terms together and factorise
4. Thanks guys, big help. You made me feel a bit thick for not already knowing that! Sometimes the most basic things trip me up.

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