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Byju's Answer
Standard XII
Mathematics
Manipulation of inequalities
Ordered pairs...
Question
Ordered pair(s) that satisfy the inequation
x
+
y
+
1
<
0
is _____.
A
(
0
,
1
)
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B
(
−
2
,
4
)
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C
(
2
,
−
4
)
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D
Both (B) and (C)
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Solution
The correct option is
D
(
2
,
−
4
)
Lets check each option one by one,
(
0
,
1
)
so put
x
=
0
,
y
=
1
in inequation, we get
x
+
y
+
1
=
0
+
1
+
1
=
2
which
is greater than zero
(
−
2
,
4
)
so put
x
=
−
2
,
y
=
4
in inequation, we get
x
+
y
+
1
=
−
2
+
4
+
1
=
3
which
is greater than zero
(
2
,
−
4
)
so put
x
=
2
,
y
=
−
4
in inequation, we get
x
+
y
+
z
=
2
−
4
+
1
=
−
1
which
is less than zero
Final answer: only option (C) satisfies the inequality
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0
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