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CAT 2020 Exam Shift 3 Solved Paper
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© examsnet.com
Question : 54
Total: 76
Let
k
be a constant. The equations
k
x
+
y
=
3
and
4
x
+
k
y
=
4
have a unique solution if and only if
|
k
|
≠
2
|
k
|
=
2
k
≠
2
k
=
2
Validate
Solution:
Simultaneous equation have a unique solution only if
a
1
a
2
≠
b
1
b
2
From the given equations, a unique solution would exist only if
k
2
≠
2
k
⇒
k
2
≠
4
⇒
|
k
|
≠
2
© examsnet.com
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