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google search
Google search results:
1: https://brainly.in/question/6706411
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2: https://www.quora.com/If-x+y-6-then-what-is-the-maximum-value-of-xy
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3: https://www.math.ucdavis.edu/~kouba/CalcOneDIRECTORY/maxminsoldirectory/MaxMinSol.html
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4: https://www.onlinemath4all.com/how-to-find-maximum-and-minimum-value-of-a-function.html
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5: https://math.stackexchange.com/questions/905661/does-x-y-have-a-maximum-value-under-the-following-conditions
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6: https://gmatclub.com/forum/if-x-and-y-are-integers-and-x-y-12-what-is-the-minimum-possible-212495.html
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7: https://books.google.com/books?id=eOnaFSKRSR0C&pg=PA262&lpg=PA262&dq=If+%7Cx%7C+++%7Cyl+%3D+7,+then+what+is+the+sum+of+minimum+and+maximum+values+of+x+y?&source=bl&ots=Kcz2i-1gT8&sig=ACfU3U2d3Y9v7_BYvHvEG1xyozglZyJUcA&hl=en&sa=X&ved=2ahUKEwjS0pzWqeTyAhVTC2MBHQ_NDbwQ6AF6BAg2EAM
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8: https://www.math.ubc.ca/~feldman/m105/maxmin.pdf
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9: https://www.chegg.com/homework-help/questions-and-answers/find-maximum-minimum-values-f-x-y-xy-ellipse-6x-2-y-2-7-maximum-value-minimum-value-find-m-q17753692
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10: https://www.youtube.com/watch?v=WJy3EEJPV3g
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