y=2x+3 x=4

To find the value of \( y \) when \( x = 4 \) in the equation \( y = 2x + 3 \), you can substitute \( x \) with 4.

\[ y = 2(4) + 3 \]

Now, calculate:

\[ y = 8 + 3 = 11 \]

So, when \( x = 4 \), the value of \( y \) is \( 11 \).