Given data:
The given list.
1) The first expression can be written as,
[tex]\begin{gathered} 9x+5y+3x+7y=12x+12y \\ =12(x+y) \end{gathered}[/tex]2) The second expression can be written as,
[tex](9x+5y)-(3x+7y)=9x-3x+5y-7y[/tex]3)The third expression can be written as,
[tex](9x+5y)-(3x-7y)=9x+5y-3x+7y[/tex]4)The fourth expression can be written as,
[tex]9x-7y+3x+5y=9x+5y+3x-7y[/tex]5)The fifth expression can be written as,
[tex]\begin{gathered} 9x-7y+3x-5y=12x-12y \\ =12(x-y) \end{gathered}[/tex]6)The sixth expression can be written as,
[tex]\begin{gathered} 9x-7y-3x-5y=6x-12y \\ =6(x-2y) \end{gathered}[/tex]Thus, the correct match is 1-1, 2-6, 3-5, 4-4, 5-2, 6-3.