Solve by Substitution y=9+3z , y=51-3z

Math
,
Eliminate the equal sides of each equation and combine.
Solve for .
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Move all terms containing to the left side of the equation.
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Add to both sides of the equation.
Add and .
Move all terms not containing to the right side of the equation.
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Subtract from both sides of the equation.
Subtract from .
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 .
Divide by .
Evaluate when .
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Substitute for .
Substitute for in and solve for .
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Remove parentheses.
Simplify .
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Multiply by .
Subtract from .
The solution of the system of equations is all the values that make the system true.
Solve by Substitution y=9+3z , y=51-3z

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