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Byju's Answer
Standard XII
Mathematics
Multiplication of Matrices
Find the solu...
Question
Find the solution of
7
x
+
5
y
−
13
z
+
4
=
0
,
9
x
+
2
y
+
11
z
=
37
,
3
x
−
y
+
z
=
2
and then find
x
+
y
+
z
Open in App
Solution
A
X
=
B
⎡
⎢
⎣
7
5
−
13
9
2
11
3
−
1
1
⎤
⎥
⎦
⎡
⎢
⎣
x
y
z
⎤
⎥
⎦
=
⎡
⎢
⎣
−
4
37
2
⎤
⎥
⎦
|
A
|
=
∣
∣ ∣
∣
7
5
−
13
9
2
11
3
−
1
1
∣
∣ ∣
∣
=
406
A
d
j
A
=
⎡
⎢
⎣
13
8
81
24
46
−
194
−
15
22
−
31
⎤
⎥
⎦
⇒
A
−
1
=
1
406
⎡
⎢
⎣
13
8
81
24
46
−
194
−
15
22
−
31
⎤
⎥
⎦
⎡
⎢
⎣
x
y
z
⎤
⎥
⎦
=
1
406
⎡
⎢
⎣
13
8
81
24
46
−
194
−
15
22
−
31
⎤
⎥
⎦
⎡
⎢
⎣
−
4
37
2
⎤
⎥
⎦
⇒
⎡
⎢
⎣
x
y
z
⎤
⎥
⎦
=
⎡
⎢
⎣
1
3
2
⎤
⎥
⎦
∴
x
+
y
+
z
=
6
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0
Similar questions
Q.
x
+
5
y
+
4
z
=
3
...(1)
2
x
+
2
y
+
3
z
=
4
...(2)
4
x
−
2
y
+
z
=
9
...(3)
Find
x
,
y
,
z
Q.
If
x
=
a
,
y
=
b
,
z
=
c
is a solution of the system of linear equations
x
+
8
y
+
7
z
=
0
,
9
x
+
2
y
+
3
z
=
0
,
x
+
y
+
z
=
0
such that the point
(
a
,
b
,
c
)
lies on the plane
x
+
2
y
+
z
=
6
, then
2
a
+
b
+
c
equals.
Q.
If
x
,
y
,
z
∈
R
&
△
=
∣
∣ ∣
∣
x
x
+
y
x
+
y
+
z
2
x
5
x
+
2
y
7
x
+
5
y
+
2
z
3
x
7
x
+
3
y
9
x
+
7
y
+
3
z
∣
∣ ∣
∣
=
−
16
then value of
x
is
Q.
If
x
,
y
,
z
∈
R
&
Δ
=
∣
∣ ∣
∣
x
x
+
y
x
+
y
+
z
2
x
5
x
+
2
y
7
x
+
5
y
+
2
z
3
x
7
x
+
3
y
9
x
+
7
y
+
3
z
∣
∣ ∣
∣
=
−
16
then value of
x
is
Q.
Find nature of solution for given system of equations
2
x
+
y
+
z
=
3
;
x
+
2
y
+
z
=
4
;
3
x
+
z
=
2
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