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Bu Mila membeli 3 botol kecap manis, 1botol kecap asin dan 2 botol kecap ikan seharga Rp 200.000 , 00 . Bu Mita membeli 1 botol kecap manis, 2 botol kecap asin dan 1 botol kecap ikan dan ia membayar Rp 125.000 , 00 . Bu Meme membeli 2 botol kecap manis, 1 botol kecap asin dan 2 botol kecap ikan seharga Rp 175.000 , 00 . Jika Bu Moni membeli 3 botol kecap manis, 2 botol kecap asin dan 5 botol kecap ikan, maka berapa harga barang belanjaan Bu Moni!

Bu Mila membeli 3 botol kecap manis, 1 botol kecap asin dan 2 botol kecap ikan seharga . Bu Mita membeli 1 botol kecap manis, 2 botol kecap asin dan 1 botol kecap ikan dan ia membayar . Bu Meme membeli 2 botol kecap manis, 1 botol kecap asin dan 2 botol kecap ikan seharga . Jika Bu Moni membeli 3 botol kecap manis, 2 botol kecap asin dan 5 botol kecap ikan, maka berapa harga barang belanjaan Bu Moni!

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harga barang belanjaan Bu Moni adalah .

harga barang belanjaan Bu Moni adalah Rp space 375.000 comma 00.

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Misalkan harga kecap manis adalah x, harga kecap asin adalah y dan harga kecap ikan adalah z, maka model matematikanya adalah: Eliminasi (1) dan (2), sehingga: Eliminasi (2) dan (3), sehingga: Substitusi nilai y ke dalam persamaan (4) , sehingga: Substitusi nilai x dan y ke persamaan (2), sehingga: Dengan demikian, harga barang belanjaan Bu Moni adalah .

Misalkan harga kecap manis adalah x, harga kecap asin  adalah y dan harga kecap ikan adalah z, maka model matematikanya adalah:

table attributes columnalign right center left columnspacing 0px end attributes row cell 3 x plus y plus 2 z end cell equals cell Rp space 200.000 comma 00 space........ space left parenthesis 1 right parenthesis end cell row cell x plus 2 y plus z end cell equals cell Rp space 125.000 comma 00 space........ space left parenthesis 2 right parenthesis end cell row cell 2 x plus y plus 2 z end cell equals cell Rp space 175.000 comma 00 space........ space left parenthesis 3 right parenthesis end cell end table  

Eliminasi (1) dan (2), sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell table row cell 3 x plus y plus 2 z equals Rp space 200.000 comma 00 end cell cell open vertical bar cross times 1 close vertical bar end cell cell 3 x plus y plus 2 z equals Rp space 200.000 comma 00 end cell row cell x plus 2 y plus z equals Rp space 125.000 comma 00 end cell cell open vertical bar cross times 2 close vertical bar end cell cell 2 x plus 4 y plus 2 z equals Rp space 250.000 comma 00 end cell end table end cell end table space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space top enclose space space space space x minus 3 y plus 0 equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank Rp 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 250 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank. end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 000 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 00 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank space end table end enclose space top enclose blank end enclose space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space x minus 3 y equals table attributes columnalign right center left columnspacing 0px end attributes row blank blank Rp 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 250 end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank. end table table attributes columnalign right center left columnspacing 0px end attributes row blank blank 000 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 cell 00 space.... left parenthesis 4 right parenthesis end cell end table   

Eliminasi (2) dan (3), sehingga:

table row cell x plus 2 y plus z equals Rp space 125.000 comma 00 space open vertical bar cross times 2 close vertical bar 2 x plus 4 y plus 2 z equals Rp space 250.000 comma 00 end cell row cell 2 x plus y plus 2 z equals Rp space 175.000 comma 00 space open vertical bar cross times 1 close vertical bar space space 2 x plus y plus 2 z equals Rp space 175.000 comma 00 end cell end table space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space stack space space space space space space space space space space space space space space space 3 y equals Rp space 75.000 comma 00 space space space space with bar on top space blank with bar on top space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space space y equals Rp space 25.000 comma 00  

Substitusi nilai y ke dalam persamaan (4) , sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell x minus 3 y end cell equals cell negative Rp space 50.000 comma 00 end cell row cell x minus 3 left parenthesis Rp space 25.000 comma 00 right parenthesis end cell equals cell negative Rp space 50.000 comma 00 end cell row cell x minus Rp space 75.000 comma 00 end cell equals cell negative Rp space 50.000 comma 00 end cell row x equals cell negative Rp space 50.000 comma 00 plus Rp space 75.000 comma 00 end cell row x equals cell Rp space 25.000 comma 00 end cell end table 

Substitusi nilai x dan y ke persamaan (2), sehingga:

table attributes columnalign right center left columnspacing 0px end attributes row cell x plus 2 y plus z end cell equals cell Rp space 125.000 comma 00 end cell row cell Rp space 25.000 comma 00 plus 2 left parenthesis Rp space 25.000 comma 00 right parenthesis plus z end cell equals cell Rp space 125.000 comma 00 end cell row cell Rp space 25.000 comma 00 plus Rp space 50.000 comma 00 plus z end cell equals cell Rp space 125.000 comma 00 end cell row cell Rp space 75.000 comma 00 plus z end cell equals cell Rp space 125.000 comma 00 end cell row z equals cell Rp space 125.000 comma 00 minus Rp space 75.000 comma 00 end cell row z equals cell Rp space 50.000 comma 00 end cell end table 

table attributes columnalign right center left columnspacing 0px end attributes row cell Harga space barang space belanjaan space Bu space Moni end cell equals cell 3 straight x plus 2 straight y plus 5 straight z end cell row blank equals cell 3 left parenthesis Rp space 25.000 comma 00 right parenthesis plus 2 left parenthesis Rp space 25.000 comma 00 right parenthesis plus 5 left parenthesis Rp space 50.000 comma 00 right parenthesis end cell row blank equals cell Rp space 75.000 comma 00 plus Rp 50.000 comma 00 plus Rp space 250.000 comma 00 end cell row blank equals cell Rp space 375.000 comma 00 end cell end table 

  Dengan demikian, harga barang belanjaan Bu Moni adalah Rp space 375.000 comma 00.

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