contestada

I need help with this:

Solve for c

a=1/5(b+c)

A. c= a-5b
B. c= b5-a
C. c= 5a-5b
D. c= 5a-b

And for the record im not getting people to do my homework. I am lost I tried simplifying both sides of the equation then isolating the variables but i couldn't get any of the options i got c= -b+5a

if you could just give me a hand i would be very thankful :)

Respuesta :

sqdancefan
By the commutative property of addition, the answer you got
  c = -b+5a
is identical to selection ...
  D. c=5a-b



The commutative property tells you the order of addition doesn't matter, so
  (-b)+(5a) = (5a)+(-b) = 5a-b
(This is one of the reasons we study these properties.)