+0  
 
0
122
1
avatar

2/x + 2/y = 30
x + y = 10

If the above equations are true simultaneously, then find the value of xy.

 Feb 7, 2022
 #1
avatar+36435 
+3

2/x + 2/y = 30     Multiply this equation by xy (both sides)

2y  + 2x = 30 xy

2 ( x+y) = 30 xy

1/15 ( x+y) = xy
x + y = 10     <==== (given)
   1/15 ( 10) = xy

       2/3 = xy

 Feb 7, 2022

34 Online Users