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Question

If 3xy=27, 3x+y=243, what is the value of x?

A
1
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B
2
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C
3
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D
4
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Solution

The correct option is C 4
3xy=27=33........(1)
And 3x+y=243=35........(2)

Multiply both the equations
3x+y3xy=3335
3x+y+xy=33+5=38
32x=38
2x=8 .................. Equate exponents
x=4

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