i need to make c the subject in this formula? any help would be nice please.

s=c+mt

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- Nov 19th 2009, 06:40 PMnexerRearrange formula
i need to make c the subject in this formula? any help would be nice please.

s=c+mt - Nov 19th 2009, 06:44 PMukorov
- Nov 19th 2009, 06:59 PMWilmer
- Nov 19th 2009, 08:47 PMukorov
- Nov 19th 2009, 10:46 PMnexer
feel like i really suck at algebra, like i also need to know to rearrange the formula so i can make t the subject

S=c+mt

i got s-c/m=t

? Guessing wrong? - Nov 20th 2009, 03:16 AMHallsofIvy
The problem is "guessing" at all! The only reason c, in s= c+ mt is not "by itself" already is that mt is added to it. To "undo" that, do the opposite: the opposite of "add mt" is "subtract mt". Subtract mt from both sides to get s-mt= c which is the same as c= s- mt.

Now, t, in s= c+ mt is not "by itself" is that**two**things have been done to it: to get to "c+ mt" from t, you would "multiply by m" and "add c" in that order. To "undo" it, do the opposite things in the opposite order: first "subtract c" then "divide by t".

From s= c+ mt, subtracting c from both sides gives s- c= mt. Now divide both sides by m- but be sure to show that the**entire**right side, s- c, is divided by m, not just "c": use**parentheses**(s-c)/m= t, not "s- c/m" which means s- (c/m)! - Nov 20th 2009, 06:03 AMnexer
Sorry, it wasn't actually a "guess" i tried to work it out, that final answer is what i had on paper!

- Nov 20th 2009, 06:16 AMWilmer
Geezzzz...can your teacher not help you?