Diketahui 3/x + 7/y = 27 dan 4/x + 3/y = 17. Nilai 12xy = ....

Diketahui 3/x + 7/y = 27 dan 4/x + 3/y = 17. Nilai 12xy = ….

Misal:
1/x= a
1/y= b
$3a + 7b = 27 | times 4| \ 4a + 3b = 17 | times 3| \ - - - - - - - - \ 12a + 28b = 108 \ 12a + 9b = 51 \ - - - - - - - - ( - ) \ 19b = 57 \ b = 3 \ cari : a \4a + 3(3) = 17 \ 4a + 9 = 17 \ 4a = 8 \ a = 2 \ \ jadi \ x = frac{1}{2} : dan : y = frac{1}{3} \ \ 12xy \ = 12 times frac{1}{2} times frac{1}{3} \ = 12 times frac{1}{6} \ = 2$

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