Mathematics, 11.10.2021 05:40, brittanysanders

¿Cuáles de estas estrategias eliminan una variable en el sistema de ecuaciones? −7x+2y=5
3x−5y=−5

a) Suma las ecuaciones.
b) Multiplica por 555 la primera ecuación, multiplica por 222 la segunda ecuación, luego suma las ecuaciones.
c) Multiplica por 333 la primera ecuación, multiplica por 777 la segunda ecuación, luego suma las ecuaciones.

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¿Cuáles de estas estrategias eliminan una variable en el sistema de ecuaciones? −7x+2y=5
3x−...