Finding the Common Factor in 2y + 4: Algebraic Expression Simplification

Consider the expression $2y + 4$.

Decompose each term into factors:

$2y$ can be rewritten as $2 \cdot y$.

$4$ can be rewritten as $2 \cdot 2$.

The common factor of these terms is $2$.

This means you can factor the expression as $2(y + 2)$. Therefore, the common factor is $2$.