Question

Which value of a below solves the equation: 3a +1=-a +3?

(1) -6
(2) 8
(3) -1
(4) 5

Answer 1

None, the answer should be a=1/2

Explanation:

Lets solve the system by ourselves.

Lets sum 'a' variable to both sides of equality sign.

We have

4a+1=3

Now lets subtract 1 to both sides of equality sign

4a=2

we obtain a=1/2.