hello
to solve this, we need to add both sides which is equal to 4x
[tex]\begin{gathered} uv=2x+1 \\ vw=11 \end{gathered}[/tex]uv + vw = 4x
[tex]\begin{gathered} uv+vw=4x \\ 2x+1+11=4x \\ 2x+12=4x \\ \text{collect like terms} \\ 4x-2x=12 \\ 2x=12x=6 \end{gathered}[/tex]x = 6
[tex]\begin{gathered} uv=2x+1 \\ uv=2(6)+1 \\ uv=13 \end{gathered}[/tex]