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Pertanyaan

Diketahui titik A ( − 2 , − 1 ) , B ( x , y ) , dan C ( 10 , 5 ) segaris. Jika titik berada di antara A dan B sedemikian sehingga AP : PB = 4 : 1 , maka CB = ....

Diketahui titik  segaris. Jika titik Error converting from MathML to accessible text. berada di antara A dan B sedemikian sehingga , maka  ....

  1. begin mathsize 14px style 2 straight i with rightwards arrow on top minus straight j with rightwards arrow on top end style 

  2. begin mathsize 14px style negative 2 straight i with rightwards arrow on top plus straight j with rightwards arrow on top end style 

  3. begin mathsize 14px style negative 2 straight i with rightwards arrow on top minus straight j with rightwards arrow on top end style 

  4. begin mathsize 14px style 4 straight i with rightwards arrow on top minus 8 straight j with rightwards arrow on top end style 

  5. begin mathsize 14px style 8 straight i with rightwards arrow on top plus 4 straight j with rightwards arrow on top end style 

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Jawaban terverifikasi

Jawaban

jawaban yang tepat adalah C.

jawaban yang tepat adalah C.space space  

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Pembahasan

Misalkan masing-masing menyatakan vektor posisi dari A, B, C, dan P, maka Kemudian diketahui bahwa Diperoleh , sehingga Perhatikan bahwa, Kemudian, Diperoleh kordinat titik B adalah , sehingga Jadi, jawaban yang tepat adalah C.

Misalkan begin mathsize 14px style straight a with rightwards arrow on top comma blank straight b with rightwards arrow on top comma blank straight c with rightwards arrow on top comma blank dan blank straight p with rightwards arrow on top end style masing-masing menyatakan vektor posisi dari A, B, C, dan P, maka

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight a with rightwards arrow on top end cell equals cell open parentheses table row cell negative 2 end cell row cell negative 1 end cell end table close parentheses end cell row cell straight b with rightwards arrow on top end cell equals cell open parentheses table row straight x row straight y end table close parentheses end cell row cell straight c with rightwards arrow on top end cell equals cell open parentheses table row 10 row 5 end table close parentheses end cell row cell straight p with rightwards arrow on top end cell equals cell open parentheses table row 6 row 3 end table close parentheses end cell end table end style  

Kemudian diketahui bahwa begin mathsize 14px style AP colon PB equals straight m colon straight n equals 4 colon 1 end style 

Diperoleh begin mathsize 14px style straight m equals 4 blank dan blank straight n equals 1 end style, sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight p with rightwards arrow on top end cell equals cell fraction numerator straight m straight b with rightwards arrow on top plus straight n straight a with rightwards arrow on top over denominator straight m plus straight n end fraction end cell row cell open parentheses table row 6 row 3 end table close parentheses end cell equals cell fraction numerator 4 open parentheses table row straight x row straight y end table close parentheses plus open parentheses table row cell negative 2 end cell row cell negative 1 end cell end table close parentheses over denominator 4 plus 1 end fraction end cell row cell open parentheses table row 6 row 3 end table close parentheses end cell equals cell fraction numerator open parentheses table row cell 4 straight x end cell row cell 4 straight y end cell end table close parentheses plus open parentheses table row cell negative 2 end cell row cell negative 1 end cell end table close parentheses over denominator 5 end fraction end cell row cell open parentheses table row 6 row 3 end table close parentheses end cell equals cell fraction numerator open parentheses table row cell 4 straight x minus 2 end cell row cell 4 straight y minus 1 end cell end table close parentheses over denominator 5 end fraction end cell row cell open parentheses table row 6 row 3 end table close parentheses end cell equals cell 1 fifth open parentheses table row cell 4 straight x minus 2 end cell row cell 4 straight y minus 1 end cell end table close parentheses end cell row cell 5 open parentheses table row 6 row 3 end table close parentheses end cell equals cell open parentheses table row cell 4 straight x minus 2 end cell row cell 4 straight y minus 1 end cell end table close parentheses end cell row cell open parentheses table row 30 row 15 end table close parentheses end cell equals cell open parentheses table row cell 4 straight x minus 2 end cell row cell 4 straight y minus 1 end cell end table close parentheses end cell end table end style

Perhatikan bahwa,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 4 straight x minus 2 end cell equals 30 row cell 4 straight x end cell equals 32 row straight x equals 8 end table end style 

Kemudian,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 4 straight y minus 1 end cell equals 15 row cell 4 straight y end cell equals 16 row straight y equals 4 end table end style 

Diperoleh kordinat titik B adalah Error converting from MathML to accessible text., sehingga

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell CB with rightwards arrow on top end cell equals cell open parentheses table row cell 8 minus 10 end cell row cell 4 minus 5 end cell end table close parentheses end cell row blank equals cell open parentheses table row cell negative 2 end cell row cell negative 1 end cell end table close parentheses end cell row blank equals cell negative 2 straight i with rightwards arrow on top minus straight j with rightwards arrow on top end cell end table end style 

Jadi, jawaban yang tepat adalah C.space space  

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