First, we find the Greatest Common Factor (GCF) between 6 and 12. It's important to remember that the GCF refers to the greatest number that can divide by each number. In this case, we can easily deduct that 6 is the greatest number that divides each of them.
So, the GCF is 6. Once we know the GCF, we use the result of each division to express the factored expression.
Observe that the GCF is the coefficient of the binomial and the result of each division it represents each new term.
Therefore, the factored expression is 6(y - 2).