,

Subtract from both sides of the equation.

Replace all occurrences of in with .

Simplify .

Simplify each term.

Apply the distributive property.

Multiply by .

Multiply by .

Combine the opposite terms in .

Subtract from .

Add and .

Since is not true, there is no solution.

No solution

Solve by Substitution -x-3y=9 , x+3y=9