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CAT 2017 Quantitative Ability
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© examsnet.com
Question : 4
Total: 34
Let
f
(
x
,
y
)
−
|
x
+
y
|
and
g
(
x
,
y
)
=
|
x
−
y
|
, then how many ordered pairs of the form
(
x
,
y
)
would satisfy
f
(
x
>
y
)
=
g
(
x
,
y
)
1
2
4
Infinitely many
Validate
Solution:
|x + y| = | x - y|
⇒
(
x
+
y
)
2
=
(
x
−
y
)
2
⇒
4
x
y
=
0
⇒ either x = 0 or y = 0
If x = 0 and y is any real number, we have infinite possible values of y as
|0 + y| = |0 - y| =>|y| =|- y|
Similarly, (x, 0) where x can be any real number also satisfies |x + 0| = |x - 0|
So, there are infinite number of solutions.
© examsnet.com
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