Question

16. Find the value of y if a) 3y + 12 = 27 b) 3(y + 12) = 27​

Answer 1

Solution

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2x+3y=12 xy=6

8x

3

+27y

3

=(2x)

3

+(3y)

3

=a

3

+b

3

=(a+b)(a

2

+b

2

−ab)

8x

3

+27y

3

=(2x+3y)((2x)

2

+(3y)

2

−(2x)(3y))

=(12)[(2+3y)

2

−12xy−6xy]

=(12)[(12)

2

−18(6)]

=12[144−108]

=12×36

=432.