1. ## Rearrange formula

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

s=c+mt

2. Originally Posted by nexer
i need to make c the subject in this formula? any help would be nice please.

s=c+mt
c = s - mt

3. Originally Posted by nexer
i need to make c the subject in this formula? any help would be nice please.
s=c+mt
Nexer, any reason why you couldn't solve that?

4. Originally Posted by Wilmer
Nexer, any reason why you couldn't solve that?
because he has just started learning algebra

5. 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?

6. Originally Posted by nexer
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?
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)!

7. Sorry, it wasn't actually a "guess" i tried to work it out, that final answer is what i had on paper!