To find an equivalent equation to \( 2x + 3y = 5 \) by multiplying it by 4, you simply multiply each term in the equation by 4.
Starting with the original equation:
\[ 2x + 3y = 5 \]
Now, multiply each term by 4:
\[ 4(2x) + 4(3y) = 4(5) \]
This simplifies to:
\[ 8x + 12y = 20 \]
So, the equation \( 2x + 3y = 5 \) is equivalent to:
\[ 8x + 12y = 20 \]