To help us to graph the 3x + 4y = 12, we can isolate y
[tex]\begin{gathered} 3x+4y=12 \\ \\ 4y=12-3x \\ \\ y=\frac{12}{4}-\frac{3}{4}x \\ \\ y=3-\frac{3}{4}x \end{gathered}[/tex]Therefore it's a line with equation
[tex]y=3-\frac{3}{4}x[/tex]We have y = 3 when x = 0, and x = 4 when y = 0, therefore
