To find an equation equivalent to \( 2x + 3y = 5 \) by multiplying the entire equation by 4, we perform the following multiplication:
\[ 4(2x + 3y) = 4(5) \]
Distributing the 4, we get:
\[ 8x + 12y = 20 \]
So, the equation \( 2x + 3y = 5 \) is equivalent to:
\[ 8x + 12y = 20 \]