Here, we want to write the given equation in terms of y
Simply put, we want to make y the subject of the formula
We proceed as follows;
[tex]\begin{gathered} \text{Given ;} \\ 3x\text{ + 4y = 12} \\ 4y\text{ = 12-3x (divide through by 4)} \\ y\text{ = }\frac{(12-3x)}{4} \\ \\ \end{gathered}[/tex]