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

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

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