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 Algebra
 making whatever the subject of the formula
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mwin002
New Member

New Zealand
2 Posts

Posted - 06/04/2013 :  00:14:07  Show Profile  Reply with Quote
Hi Everyone
Im very new to this and this type of math so please bear with me
Please excuse writing i am very new to this

*Make n2 the subject of the formula.

n1 sinθ1 = n2 sinθ2


*Make t the subject of the formula

A = p(1+r)ntn

Hopefully i have written it correctly
thanks for your replies

cheers
Mat
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royhaas
Moderator

USA
3059 Posts

Posted - 06/04/2013 :  13:03:25  Show Profile  Reply with Quote
Please read and follow the Posting Rules.
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the_hill1962
Advanced Member

USA
1468 Posts

Posted - 06/06/2013 :  12:04:28  Show Profile  Reply with Quote
I have not heard of making a variable the "subject" of a formula. However, I looked it up and my assumption was correct.
You might want to look up how to "solve literal equations".
Since you did not show us any work or ask any sort of related question besides just stating that you are new to this type of math, I will provide an example (as you will find if you do the search I suggested).:
make y the subject of 5x+2y=7
You need to isolate the term(s) with the "y". That is "2y".
So, subtract 5x from each side.
That is 2x=7-5x
Rearranging gives
2y=-5x+7 (this step is not necessary unless you are wanting standard form)
Now, divide each side by 2.
y=(-5x+7)/2
Distributing gives
y = -2.5x + 3.5

Note, if you can solving simple equations, then this process should be familiar to you. Yes, it is a little strange but if you read about solving literal equations, you should be able to get it.
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