Question

Solve by Cramer's rule :
x + 2y,+ 3z = 6.
2x + 4y + z = 7.
3x + 2y + 9z = 14.​

Answer 1

Answer:

x

∣

∣

∣

∣

∣

∣

∣

∣

1

2

3

2

4

2

3

1

9

∣

∣

∣

∣

∣

∣

∣

∣

=

∣

∣

∣

∣

∣

∣

∣

∣

6

7

14

2

4

2

3

1

9

∣

∣

∣

∣

∣

∣

∣

∣

or xD=D

1

Operating C

1

−(C

2

+C

3

)on D

1

, we get

D

1

=

∣

∣

∣

∣

∣

∣

∣

∣

1

2

3

2

4

2

3

1

9

∣

∣

∣

∣

∣

∣

∣

∣

= D.

Hence xD = D or x=1

Similarly y=1,z=1.

Step-by-step explanation:

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