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Question

To transform x+2y+3z=9;2x+3y+z=4;4x+5y+4z=15 in a matrix equation and solve them

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Solution

Ax=B123231454xyz2415
=123231454=1(125)2(84)+3(1012)
=7
1=9234311554=9(125)2(1615)+3(2045)
=14
2=1932414154=(1615)9(84)+3(3016)
=136+42=7
3=1292344115=1(454)2(3016)+9(212)
=412890=77
x=147=2
y=77=1
z=777=11

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