Question

B = 1/2 a - 3c rearrange to make a the subject

Answer 1

Explanation:

`b = (1)/(2) a- 3c`

Multiply both sides ✖ of the equation by 2

`2b = a - 6c`

Move the variable to the left-hand side and change its sign

`- a + 2b = - 6c`

MOVE THE VARIABLE TO THE RIGHT-HAND SIDE AND CHANGE ITS SIGN

`- a = - 6c - 2b`

Change the sign on both sides of the equation

`a = 6c + 2b`

Therefore the answer is

`a = 6c + 2b`

Answer 2

`\huge \boxed{a = 2b + 6c}`

Explanation:

b = 1/2a - 3c

Add 3c to both sides of the equation.

b + 3c = 1/2a - 3c + 3c

b + 3c = 1/2a

Switch sides.

1/2a = b + 3c

Multiply both sides of the equation by 2.

2(1/2a) = 2(b + 3c)

a = 2b + 6c