Question

x-y=x+y/7=xy/4 then the numerical value of xy=?

Answer 1

☆☆heya your answer is here☆☆


x_y=x+y/7=x*y/4 =k (suppose that)
 then x-y=k  (1)
& x+y=7k      (2)
 by solve equ. 1 &2  
    x=4k, y=3k
we know that
x*y=4k
​12k^2=4k
​k=1/3
x*y=4/3

Answer 2

Given : x-y=x+y/7=xy/4

To Find :  numerical value of xy

Solution:

x - y  = (x + y)/7  = xy/4

Taking 1st 2 equations

x - y  = (x + y)/7

=> 7x - 7y  = x + y

=> 6x = 8y

=> 3x = 4y

=> x = 4y/3

x -y  = 4y/3 - y   = y/3

(x + y)/7  = y/3

xy/4  = (4y/3).y/4  = y/3

=> y = 1

x = 4y/3 => x = 4/3

Hence x = 4/3

y = 1

xy = 4/3

x - y  = 1/3

(x + y)/7 = 1/3

xy/4 = 1/3

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