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mrinal2100
- Senior | Next Rank: 100 Posts
- Posts: 60
- Joined: Wed Jun 25, 2008 9:33 pm
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|x+2|=|y+2| what is the value of x+y?
(1) xy<0
(2) x>2 y<2
(a) When both x and y are greater than - 2 ; x + 2 = y + 2 ; x = y
(b) When both x and y are less than - 2 ; - x - 2 = - y - 2 ; x = y
(c) When x is less than -2 and y is greater than -2 ; - x - 2 = y + 2 ; x + y = - 4
(d) When x is greater than -2 and y is less than -2 ; x + 2 = - y - 2 ; x + y = - 4
1)xy<0
meaninig
x<0 y>0 or x>0 y<0
taking |x+2|=|y+2|
when -2<x<0 and y>0
x+2=y+2
x=y
when x<-2 and y>0
then -x-2=y+2
y+x=-4
insuffecient
(2) x>2 y<2
when -2<y<2 and x>2
|x+2|=|y+2|
x+2=y+2
x=y
when y<-2 and x>2
|x+2|=|y+2|
x+2=-y-2
x+y=-4
insuffecient
taking both of them together
x>2 and -2<y<2
|x+2|=|y+2|
x+2=y+2
x=y
and x>2 and y<-2
|x+2|=|y+2|
x+2=-y-2
x+y=-4
as a result answer is E
ia m confused whether my approach is correct or not
(1) xy<0
(2) x>2 y<2
(a) When both x and y are greater than - 2 ; x + 2 = y + 2 ; x = y
(b) When both x and y are less than - 2 ; - x - 2 = - y - 2 ; x = y
(c) When x is less than -2 and y is greater than -2 ; - x - 2 = y + 2 ; x + y = - 4
(d) When x is greater than -2 and y is less than -2 ; x + 2 = - y - 2 ; x + y = - 4
1)xy<0
meaninig
x<0 y>0 or x>0 y<0
taking |x+2|=|y+2|
when -2<x<0 and y>0
x+2=y+2
x=y
when x<-2 and y>0
then -x-2=y+2
y+x=-4
insuffecient
(2) x>2 y<2
when -2<y<2 and x>2
|x+2|=|y+2|
x+2=y+2
x=y
when y<-2 and x>2
|x+2|=|y+2|
x+2=-y-2
x+y=-4
insuffecient
taking both of them together
x>2 and -2<y<2
|x+2|=|y+2|
x+2=y+2
x=y
and x>2 and y<-2
|x+2|=|y+2|
x+2=-y-2
x+y=-4
as a result answer is E
ia m confused whether my approach is correct or not













