X + Y = 6, then XY=? a) 36 b) 8 c) 3 4) 30

• From given options
  if
  
  X + Y = 6, then XY= 8 as X=4, Y=2
• 12 years agoHelpfull: Yes(32) No(2)
• answer is 8
  only 4 and 2 only will suits for X and Y
• 12 years agoHelpfull: Yes(9) No(2)
• ans is (b)
  x+y=6
  4*2=8
  4+2=6
• 11 years agoHelpfull: Yes(4) No(3)
• from given options,,
  X+Y=6 mens take X=4and Y=2 ow XY=8 so ans is 8
• 11 years agoHelpfull: Yes(3) No(1)
• x+y=6
  1/x+1/y=1/6
  y+x/xy=1/6
  6/xy=1/6
  xy=36
• 8 years agoHelpfull: Yes(3) No(7)
• 8 ans is 2*4 8
• 9 years agoHelpfull: Yes(0) No(0)
• Given x+y=6, Squaring on both sides
  Then X2+Y2+2XY=36
  the above condition satisfies only if x=2, y=4 or x=4 ,y=2
  then xy=8.
  answer is 8
• 8 years agoHelpfull: Yes(0) No(1)
• x = 2
  y = 4
  x+y = 6
  then
  xy = 4*2=8
• 8 years agoHelpfull: Yes(0) No(1)
• b. 8
  X=4, Y=2
  XY=8
• 7 years agoHelpfull: Yes(0) No(0)
• many users gave solution as 8 and said that only (4,2) satisfies.
  But they are wrong
  (4,2)
  (2,4),
  (3,3),
  (5,1),
  (6,0)
  and many more values that satisfies the x+y=6 equation in infinity since their domain is R.
  hence the below is correct solution
  x+y=6
  1/x+1/y=1/6
  x+y/(xy)=1/6
  6/xy=1/6
  xy=36 is the answer.
• 4 years agoHelpfull: Yes(0) No(0)