Question

Suppose a+b=2a. which one of these expressions equals b-a?

A. 2b
B. 2a
C. 0
D. a/b
E. -2b

Answer 1

If a + b = 2a, then

a + b - 2a = 2a - 2a
b + a - 2a = 2a - 2a
b - a = 2a - 2a = 0

Therefore, b - a = 0.

Answer 2

ANSWER

C.

`0`

Step-by-step explanation

The given equation is


`a + b = 2a`

We make b the subject to get,


`b = 2a - a`

This simplifies to,


`b = a`

Subtracting

`a`
from both sides will give us,


`b - a = a - a`


The right hand side will now simplify to zero,

Therefore


`b - a = 0`