Q.

If  3x+6y=4xy,9x+8y=7xy, then  (x,y)=

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a

(2,3)

b

(3,2)

c

(3,2)

d

(3,2)

answer is A.

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Detailed Solution

Given equations  3x+6y=4xy(1)

9x+8y=7xy(2)

Option (A) (2,3)

x=2,y=3 substitute in equation (1)

3(2)+6(3)=4×2×3

6+18=24

24=24 false

x=2,y=3 substitute in the equation (2)

9(2)+8(3)=7×2×3

18+24=42

42=42  true

(2,3) is solution of the given equations

Option (B) : (3,2)

 x=3,y=2 substitute in equation (1)

3(3)+6(2)=4×3×2

9+12=24

2124 false

(3,2) is not a solutions.

Option ( C) : (3,2) 

x=3,y=2 substitute in equation (1)

3(3)+6(2)=4×3×2

9+12=24

+324 false

(3,2) is not a solutions

Option (D) : (3,2)

x=3,y=2 substitute in equation (1)

3(3)+6(2)=4×3×2

912=24

3=24    false

(3,2)  is not a solution

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