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ngann
11-02-2008, 02:28 PM
p=r-c - asked to rewrite the formula to solve for c - Profit equals revenue minus cost
I am hitting a block on this one
Here is what I came up with p-r=c
I know this can't be right because c is negative in the original equation. Do I need to divide by -c to get it by itself?

Loren
11-02-2008, 03:25 PM
Add c to both sides of the equation. Then subtract p from both sides of the equation.

Here is what I came up with p-r=c <<< should have been p-r=-c. From here, just multiply both sides by -1.

ngann
11-02-2008, 03:58 PM
Thank you Loren, that does make better sense and I tested it with real numbers.

Subhotosh Khan
11-02-2008, 04:48 PM
p=r-c - asked to rewrite the formula to solve for c - Profit equals revenue minus cost
I am hitting a block on this one
Here is what I came up with

p - r = -c ............. This is perfectly OKay - but to make 'c' positive

Change sign of everybody

-p + r = c .............you could leave it right here or write it as

c = r - p


I know this can't be right because c is negative in the original equation. Do I need to divide by -c to get it by itself?