,

Reorder and .

Replace all occurrences of in with .

Simplify each term.

Apply the distributive property.

Multiply by .

Multiply by .

Simplify by adding terms.

Subtract from .

Add and .

Since , the equation will always be true.

Always true

Remove any equations from the system that are always true.

Solve by Substitution y=2-x , 3x+3y=6