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Question

Solve by matrix inversion method.
4x6y+5z=1

6x+9y20z=1

2x+3y10z=4

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Solution

Above system of equation can be written in matrix form as:

AX=B

X=A1B

A=23104656920,X=uvw,B=412, where u=1x,v=1y,w=1z

|A|=∣ ∣23104656920∣ ∣=2(12045)3(8030)+10(36+36)=150+330+720=12000

For adjA: A11=12045=75

A12=(6090)=150

A13=15+60=75

A12=(8030)=110

A22=4060=100

A32=(1040)=30

A13=36+36=72

A23=(1818)=0

A33=1212=24

adj.A=75110721501000753024T=75150751101003072024

A1=1|A|.adj.A=1120075150751101003072024

uvw=1120075150751101003072024412

uvw=11200300+150+300440100+60288+048

uvw=11200600400240

uvw=⎢ ⎢ ⎢121315⎥ ⎥ ⎥

x=2,y=3,z=5

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