Question

Profit:p=r-c;solve for c

Answer 1

p=r-c
Subtract by r on both sides.
p-r=-c
Divide by negative one on both sides.
(p-r)/(-1)=c
(-1)(p-r)=c
c=-p+r
c=r-p


`{\boxed{\sf c=-p+r}`

`{\boxed{\sf c=r-p}`

Answer 2

If you would like to solve p = r - c for c, you can do this using the following steps:

p = r - c /+c
p + c = r - c + c
p + c = r /-p
p + c - p = r - p
c = r - p

The correct result would be c = r - p.