Answer: (-2;8)
[tex]\left \{ {{3x+3y=18} \atop {2x+y=4}} \right. \\\\<=>\left \{ {{x+y=6} \atop {2x+y=4}} \right. \\\\=>\left \{ {{x=4-6} \atop {x+y=6}} \right. \\\\<=>\left \{ {{x=-2} \atop {x+y=6}} \right. \\\\<=>\left \{ {{x=-2} \atop {y=6-(-2)=8}} \right.[/tex]
Step-by-step explanation:
