Answer: FIRST OPTION
Step-by-step explanation:
To solve this problem you can substitute any of the given points into each system:
Point(6,1)
System #1:
[tex]3x-6y=12[/tex]
[tex]3(6)-6(1)=12[/tex]
[tex]12=12[/tex] Â
 [tex]9x-18y=36[/tex]
 [tex]9(6)-18(1)=36[/tex]
 [tex]36=36[/tex]
(This system matches the graph)
System #2:
 [tex]3x+6y=12[/tex]
 [tex]3(6)+6(1)=12[/tex]
 [tex]24=12[/tex]
 [tex]9x+18y=36[/tex]
 [tex]9(6)+18(1)=36[/tex]
 [tex]72=36[/tex]
 (The system does not matches the graph)
System #3:
 [tex]3x-6y=12[/tex]
 [tex]3(6)-6(1)=12[/tex]
 [tex]12=12[/tex]
 [tex]9x+18y=36[/tex]
 [tex]9(6)+18(1)=36[/tex]
 [tex]72=36[/tex]
(The system does not matches the graph)
System #4:
 [tex]3(6)+6(1)=12[/tex]
 [tex]24=12[/tex]
 [tex]9x-18y=36[/tex]
 [tex]9(6)-18(1)=36[/tex]
 [tex]36=36[/tex]
 (The system does not matches the graph)