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Jika , maka nilai dari a y + a z + b x + b z + c x + cy adalah....

Jika open parentheses table row 1 1 1 row a b c end table close parentheses open parentheses table row cell negative 1 end cell x row cell negative 1 end cell y row cell negative 1 end cell z end table close parentheses equals open parentheses table row cell negative 3 end cell 3 row 3 6 end table close parentheses , maka nilai dari  adalah ....

  1. begin mathsize 14px style negative 24 end style

  2. size 14px minus size 14px 15

  3. begin mathsize 14px style 0 end style

  4. begin mathsize 14px style 12 end style

  5. begin mathsize 14px style 24 end style

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N. Syafriah

Master Teacher

Jawaban terverifikasi

Jawaban

jawaban yang tepatadalah B.

jawaban yang tepat adalah B.

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Pembahasan

Perhatikan perhitungan berikut ini! Dari kesamaan matriks di atas diperoleh persamaan-persamaan sebagai berikut. Kemudian, perhatikan persamaan berikut! Ingat bahwa sehingga persamaannya menjadi seperti berikut. Dengan demikian, didapat . Jadi, jawaban yang tepatadalah B.

Perhatikan perhitungan berikut ini!

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row 1 1 1 row a b c end table close parentheses open parentheses table row cell negative 1 end cell x row cell negative 1 end cell y row cell negative 1 end cell z end table close parentheses end cell equals cell open parentheses table row cell negative 3 end cell 3 row 3 6 end table close parentheses end cell row cell open parentheses table row cell open parentheses negative 1 minus 1 minus 1 close parentheses end cell cell open parentheses x plus y plus z close parentheses end cell row cell open parentheses negative a minus b minus c close parentheses end cell cell open parentheses a x plus b y plus c z close parentheses end cell end table close parentheses end cell equals cell open parentheses table row cell negative 3 end cell 3 row 3 6 end table close parentheses end cell row cell open parentheses table row cell negative 3 end cell cell open parentheses x plus y plus z close parentheses end cell row cell open parentheses negative a minus b minus c close parentheses end cell cell open parentheses a x plus b y plus c z close parentheses end cell end table close parentheses end cell equals cell open parentheses table row cell negative 3 end cell 3 row 3 6 end table close parentheses end cell end table 

Dari kesamaan matriks di atas diperoleh persamaan-persamaan sebagai berikut.

  • table attributes columnalign right center left columnspacing 0px end attributes row cell x plus y plus z end cell equals 3 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 a 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 b 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 c 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 3 rightwards arrow cell a plus b plus c equals negative 3 end cell end table
  • table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell b y end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell c z end cell 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 6 end table 

Kemudian, perhatikan persamaan berikut!

table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses a plus b plus c close parentheses open parentheses x plus y plus z close parentheses end cell equals cell open parentheses negative 3 close parentheses open parentheses 3 close parentheses end cell row cell a x plus a y plus a z plus b x plus b y plus b z plus c x plus c y plus c z end cell equals cell negative 9 end cell row cell a x plus b y plus c z plus a y plus a z plus b x plus b z plus c x plus c y end cell equals cell negative 9 end cell end table 

Ingat bahwa table attributes columnalign right center left columnspacing 0px end attributes row blank blank a end table 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell b y end cell end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell c z end cell 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 6 end table sehingga persamaannya menjadi seperti berikut.

table attributes columnalign right center left columnspacing 0px end attributes row cell a x plus b y plus c z plus a y plus a z plus b x plus b z plus c x plus c y end cell equals cell negative 9 end cell row cell 6 plus a y plus a z plus b x plus b z plus c x plus c y end cell equals cell negative 9 end cell row cell 6 minus 6 plus a y plus a z plus b x plus b z plus c x plus c y end cell equals cell negative 9 minus 6 end cell row cell a y plus a z plus b x plus b z plus c x plus c y end cell equals cell negative 15 end cell end table

Dengan demikian, didapat table attributes columnalign right center left columnspacing 0px end attributes row blank blank a 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank a 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank b end table 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank b 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank c end table 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 blank plus end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank c 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 15 end table.

Jadi, jawaban yang tepat adalah B.

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