Solve by Substitution -x+4y=4 , x-4y=-4

Math
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Add to both sides of the equation.
Replace all occurrences of with in each equation.
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Replace all occurrences of in with .
Simplify .
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Simplify each term.
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Apply the distributive property.
Multiply by .
Multiply by .
Combine the opposite terms in .
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Add and .
Add and .
Remove any equations from the system that are always true.
Solve by Substitution -x+4y=4 , x-4y=-4

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