Just subtract them they way they are ...
3y = -6
y = -2
now sub that into either equation to find the x
Solve using elimination.
2x + 6y = 6
2x + 3y = 12
3 answers
3x + 4y = -14
3x − 10y = 14
3x − 10y = 14
do it the same way. Subtract to eliminate x.