If \[3x-7y=10\] and \[xy=-1\], then the value of \[9{{x}^{2}}+49{{y}^{ – McqOptions

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1.	If \[3x-7y=10\] and \[xy=-1\], then the value of \[9{{x}^{2}}+49{{y}^{2}}\] is __.
A.	58
B.	142
C.	104
D.	-104
Answer» B. 142

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