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Byju's Answer
Standard X
Mathematics
Comparing the Ratios of Coefficients of a Linear Equation
Find the valu...
Question
Find the value of k for which each of the following system of linear equations has an infinite number of solutions:
k
-
3
x
+
3
y
=
k
,
k
x
+
k
y
=
12
.
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Solution
The given system of equations can be written as
k
-
3
x
+
3
y
-
k
=
0
.
.
.
.
.
i
k
x
+
k
y
-
12
=
0
.
.
.
.
.
i
i
This system is of the form
a
1
x
+
b
1
y
+
c
1
=
0
a
2
x
+
b
2
y
+
c
2
=
0
where
a
1
=
k
-
3
,
b
1
=
3
,
c
1
=
-
k
and
a
2
=
k
,
b
2
=
k
,
c
2
=
-
12
For the given system of linear equations to have an infinite number of solutions
, we must have
a
1
a
2
=
b
1
b
2
=
c
1
c
2
⇒
k
-
3
k
=
3
k
=
-
k
-
12
⇒
k
-
3
k
=
3
k
and
3
k
=
-
k
-
12
⇒
k
-
3
=
3
and
k
2
=
36
⇒
k
=
6
and
k
=
±
6
⇒
k
=
6
Hence, k = 6.
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Standard X Mathematics
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