Question

Answers for both boxes please :)​

Answer 1

Answer: (-2;8)

`\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.`

Explanation: