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# Algebra/Solving

Question
Hello Fred,

How do I combine these two equations to solve for  " a ".

L^2 - r^2 = a^2

r = L x Ac / G

Thanks,
AL
WowGoHere.com

You can substitute the latter into the former, ie

L^2 - (L x Ac / G)^2 = a^2, thereafter you can take the root of the LHS to obtain the value of a.

That said, to discover the value of a, you will need the values of L, A, c and G beforehand.

Hope this helps. Peace.

Algebra

Volunteer

#### Frederick Koh

##### Expertise

I can answer questions concerning calculus, complex numbers, vectors, statistics , algebra and trigonometry for the O level, A level and 1st/2nd year college math/engineering student.

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More than 7 years of experience helping out in various homework forums. Latest presence is over at http://www.thestudentroom.co.uk/. You can also visit my main maths website http://www.whitegroupmaths.com where I have designed "question locker" vaults to store tons of fully worked math problems. A second one is currently being built. Peace.

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