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11-04-2021
Mathematics

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Solve the system by substitution.
5x + 9y = 21
-6y = x

Respuesta :

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11-04-2021

5(-6y) + 9y = 21
-30y + 9y = 21
-21y = 21
divide both sides by -21.
y = -1

Answer : y = -1

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