When the coefficients of one variable are opposites, I can _________ the equations to _________ a variable and when the coefficients of one variable are equal, I can _________the equations to _________ a variable.
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When the coefficients of one variable are opposites, I can _________ the equations to _________ a variable and when the coefficients of one variable are equal, I can _________the equations to _________ a variable.
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Answer:
When the coefficients of one variable are opposites, I can add the equations to eliminate a variable and when the coefficients of one variable are equal, I can subtract the equations to eliminate a variable.