,

Add to both sides of the equation.

Add to both sides of the equation.

Replace all occurrences of in with .

Simplify each term.

Apply the distributive property.

Multiply by .

Multiply by .

Simplify by adding terms.

Subtract from .

Subtract from .

Since , the equation will always be true.

Always true

Remove any equations from the system that are always true.

Solve by Substitution 2x-y=-2 , -2x+y-2=0