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OpenStudy (anonymous):
Which equation is equivalent to x + 3y – z = 3? 3x + 6y – 3z = 6 4x + 12y – 4z = 12 2x + 4y – 2z = 8 2x + 3y – 4z = 12
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OpenStudy (joemarket):
4x + 12y – 4z = 12, because everything is multiplied by 4 so it's equivalent.
OpenStudy (anonymous):
try to plug in x=y = 0 and then x=z=0
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