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Tentukan nilai x , y dan z dari persamaan vektor ⎝ ⎛ ​ − 1 x y ​ ⎠ ⎞ ​ + 3 ⎝ ⎛ ​ 2 z x ​ ⎠ ⎞ ​ = 5 ⎝ ⎛ ​ x − 1 z ​ ⎠ ⎞ ​ − 4 ⎝ ⎛ ​ 4 2 − 10 ​ ⎠ ⎞ ​

Tentukan nilai  dan  dari persamaan vektor

  

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F. Nur

Master Teacher

Mahasiswa/Alumni Universitas Muhammadiyah Malang

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nilai

 nilai table attributes columnalign right center left columnspacing 0px end attributes row blank blank x end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 21 over 5 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 19 over 15 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank z end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 86 over 15 end cell end table 

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Pembahasan

Sehingga diperoleh: Persamaan 1: Persamaan 2: Persamaan 3: Menentukan nilai : Subtitusikan nilai pada persamaan 2. Subtitusikan nilai dan pada persamaan 3. Jadi,nilai

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell negative 1 end cell row x row y end table close parentheses plus 3 open parentheses table row 2 row z row x end table close parentheses end cell equals cell 5 open parentheses table row x row cell negative 1 end cell row z end table close parentheses minus 4 open parentheses table row 4 row 2 row cell negative 10 end cell end table close parentheses end cell row cell open parentheses table row cell negative 1 end cell row x row y end table close parentheses plus open parentheses table row 6 row cell 3 z end cell row cell 3 x end cell end table close parentheses end cell equals cell open parentheses table row cell 5 x end cell row cell negative 5 end cell row cell 5 z end cell end table close parentheses minus open parentheses table row 16 row 8 row cell negative 40 end cell end table close parentheses end cell row cell open parentheses table row 5 row cell x plus 3 z end cell row cell y plus 3 x end cell end table close parentheses end cell equals cell open parentheses table row cell 5 x minus 16 end cell row cell negative 13 end cell row cell 5 z plus 40 end cell end table close parentheses end cell end table 

Sehingga diperoleh:

  • Persamaan 1: 5 equals 5 x minus 16 
  • Persamaan 2: x plus 3 z equals negative 13 
  • Persamaan 3: y plus 3 x equals 5 z plus 40 

Menentukan nilai x:

table attributes columnalign right center left columnspacing 0px end attributes row 5 equals cell 5 x minus 16 end cell row cell negative 5 x end cell equals cell negative 16 minus 5 end cell row cell negative 5 x end cell equals cell negative 21 end cell row x equals cell fraction numerator negative 21 over denominator negative 5 end fraction end cell row x equals cell 21 over 5 end cell end table 

Subtitusikan nilai x pada persamaan 2.

table attributes columnalign right center left columnspacing 0px end attributes row cell x plus 3 z end cell equals cell negative 13 end cell row cell 21 over 5 plus 3 z end cell equals cell negative 13 end cell row cell 3 z end cell equals cell negative 13 minus 21 over 5 end cell row cell 3 z end cell equals cell fraction numerator negative 65 minus 21 over denominator 5 end fraction end cell row cell 3 z end cell equals cell fraction numerator negative 86 over denominator 5 end fraction end cell row z equals cell fraction numerator negative 86 over denominator 5 times 3 end fraction end cell row z equals cell fraction numerator negative 86 over denominator 15 end fraction end cell end table 

Subtitusikan nilai x dan z pada persamaan 3.

table attributes columnalign right center left columnspacing 0px end attributes row cell y plus 3 x end cell equals cell 5 z plus 40 end cell row cell y plus 3 open parentheses 21 over 5 close parentheses end cell equals cell 5 open parentheses fraction numerator negative 86 over denominator 15 end fraction close parentheses plus 40 end cell row cell y plus 63 over 5 end cell equals cell fraction numerator negative 86 over denominator 3 end fraction plus 40 end cell row y equals cell fraction numerator negative 86 over denominator 3 end fraction plus 40 minus 63 over 5 end cell row y equals cell fraction numerator negative 430 plus 600 minus 189 over denominator 15 end fraction end cell row y equals cell fraction numerator negative 19 over denominator 15 end fraction end cell end table 

Jadi, nilai table attributes columnalign right center left columnspacing 0px end attributes row blank blank x end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 21 over 5 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank y end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 19 over 15 end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank comma end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank z end table table attributes columnalign right center left columnspacing 0px end attributes row blank equals blank end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank minus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell 86 over 15 end cell end table 

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