# Solve by Substitution x-3y=2 , 7x-21y=14 , 3x-9y=6 , ,
Add to both sides of the equation.
Replace all occurrences of with in each equation.
Replace all occurrences of in with .
Replace all occurrences of in with .
Simplify each equation.
Simplify .
Simplify each term.
Apply the distributive property.
Multiply by .
Multiply by .
Combine the opposite terms in .
Subtract from .
Simplify .
Simplify each term.
Apply the distributive property.
Multiply by .
Multiply by .
Combine the opposite terms in .
Subtract from .
Since , the equation will always be true.
Always true
Remove any equations from the system that are always true.
Since , the equation will always be true.
Always true
Always true
Remove any equations from the system that are always true.
Solve by Substitution x-3y=2 , 7x-21y=14 , 3x-9y=6

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