I will fan and medal!
5x+7y=31
2x+4y=16
Which of the following systems could be used to solve the given system of equations by the addition method?
10x + 14y = 31 and -10x - 20y = 16
10x + 14y = 62 and 10x + 20y = 32
-10x - 14y = -62 and 10x + 20y = 80

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yes i think so @Jdosio

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