What is the first step to solve the system using substitution? \[ \begin{array}{l}2 y+x=4 \\ 3 y=2 x+6\end{array} \] Isolate a variable in one of the equations. Set one of the equations equal to zero.

To start solving the system using substitution, let’s isolate the variable \(x\) in the first equation \(2y + x = 4\). Rearranging this gives us \(x = 4 - 2y\). Now, we have \(x\) expressed in terms of \(y\), ready for substitution! Next, we can substitute \(x = 4 - 2y\) into the second equation \(3y = 2x + 6\). This will allow us to solve for \(y\) in a single equation. Plugging in our expression for \(x\) will make the next steps much clearer!