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Mathematics 12 Online
OpenStudy (anonymous):

Solve the system by the substitution method. xy = 12 x2 + y2 = 40 A. {( 2, 6), ( 6, 2), ( 2, -6), ( 6, -2)} B. {( 2, 6), ( -2, -6), ( 2, -6), ( -2, 6)} C. {( 2, 6), ( -2, -6), ( 6, 2), ( -6, -2)} D. {( -2, -6), ( -6, -2), ( -2, 6), ( -6, 2)} I think it is A.

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