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OpenStudy (anonymous):
use substitution method 7x+9y=21 and x=57-9y (ordered pair?)
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OpenStudy (anonymous):
7(57-9y)+9y=21 399-63y+9y=21 -54y=-378 y=7 then plug in y value into either equation to find x and you'll get your ordered pair
OpenStudy (anonymous):
ordered pair (-6,7) x=-6 y=7
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