Given:
[tex]\begin{gathered} y=3x+3 \\ \\ y=x-1 \end{gathered}[/tex]Find: the value (x,y)
Sol:
[tex]\begin{gathered} y=3x+3 \\ \\ y=x-1 \end{gathered}[/tex]Substitute the value of "y" in another equation than:
[tex]\begin{gathered} x-1=3x+3 \\ \\ 3x-x=-3-1 \\ \\ 2x=-4 \\ \\ x=\frac{-4}{2} \\ \\ x=-2 \end{gathered}[/tex]Put the value in the above equation.
[tex]\begin{gathered} y=x-1 \\ \\ x=-2 \\ \\ y=(-2)-1 \\ \\ y=-3 \end{gathered}[/tex]So,
[tex]\text{ The value is \lparen-2,-3\rparen}[/tex]