solve using elimination please show how to come up with answer.

6x - 3y = 18
6x + 3y = -12

Please help!!!

2 answers

Add the two equations.

12x = 6

Solve for x and then insert that value into one of the equation to find y. To check, insert x value into the other equation.
1. x=Y/2+3

2. y= -y/2 - 1/3