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OpenStudy (anonymous):
solve by substitution 7x+4y=10, 52-9y=x
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OpenStudy (anonymous):
7(52-9y) + 4y = 10 364-63y + 4y = 10 354= 59y y= 6
OpenStudy (anonymous):
And x = 52 - 9y = 52-54 =-2
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