A= 3 (L+W) solve for W

Question

I don't understand this question so I'm asking

Answer 1

P = 2W +2L 

step is keep 2L in one side of equation , and move every thing else to the other side.

 

In moving any quantity from one side to other, change the sign. ( equivalent of adding or subtracting equal                                                                                                  quantity from both sides of equation).

 

2L = P - 2W

 

divide both sides by 2:

 

 L = p/2 - w

 

 Step is the same as solving  X in equation of  8 = 2X + 16

 2X = 8 -16 = 8

   X =4 . But, here you solve one variable in terms of other variables. 

Answer 2

Expanding the brackets: A=3L+3W,

Separaring W term from the others: 3W=A-3L,

Dividing through by 3: W=(A-3L)/3 or A/3-L

Answer 3

A = 3(L+W)

devide both side from 3, A/3 = L+W

So W = A/3 - L