odriskel49
24.03.2020 •
Mathematics
Solve the system of equations -x-y=-1−x−y=−1 and 7x+9y=17x+9y=1 by combining the equations.
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Ответ:
Justification of step A: common denominator
Justification of step B: multliplication property of equality
Step-by-step explanation:
i got it right.