y=-x

6x 6y=0

plug into second the first equation

if second eqn is 6x-6y=0 then:

6x-6(-x)=0

12x=0

x=0

if second eqn is 6x+6y=0 then:

6x+6(-x)=0

0=0

x can be any real number

y will be any real number that is equal to -x

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