Find the value of 27x3+ 8y3
, if 3x+2y=14 and x y =
8
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2
Answer:
260.5
Step-by-step explanation:
xy = 8 => x=y/8
3x + 2y = 14
3/8 + 2y = 14 => 2y = 14-3/8
2y = 112 -3/8 = 109/8 = 13.6
y = 13.6/2 = 6.8 = 7 [ approximately ]
y=7
xy = 8 => x= 8/7
27x3 + 8y3 = 81x + 24y = 81(8/7) + 24(7) = 260.5
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