Solve by Substitution 3x-9y=21 , -2x+6y=-14

Math
,
Solve for in the first equation.
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Add to both sides of the equation.
Divide each term by and simplify.
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Divide each term in by .
Cancel the common factor of .
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Cancel the common factor.
Divide by .
Simplify each term.
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Divide by .
Cancel the common factor of and .
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Factor out of .
Cancel the common factors.
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Factor out of .
Cancel the common factor.
Rewrite the expression.
Divide by .
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 .
Since , the equation will always be true.
Always true
Remove any equations from the system that are always true.
Solve by Substitution 3x-9y=21 , -2x+6y=-14

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