value of 3x+y if 9x^2+y^2=54 and xy=7
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Step-by-step explanation:
(3x+y)^2 = 9x^2+2(3x)(y)+y^2
= 9x^2+y^2+6xy
= 54+6(7)
= 54+42
= 96
√(3x+y)^2 = √96
3x+y = √16×6
= 4√6
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