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Persamaan garis 3 y = 6 x – 1 didilatasi dengan pusat P ( 0, –4) dan faktor skala − 2 1 ​ menghasilkan bayangan ….

Persamaan garis 3= 6didilatasi dengan pusat P (0, –4) dan faktor skala menghasilkan bayangan ….

  1. 6y = 12x – 35

  2. 6y = 14x – 32

  3. 6y = 12x – 32

  4. 6y = 14x – 31

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A. Rizky

Master Teacher

Mahasiswa/Alumni Universitas Negeri Malang

Jawaban terverifikasi

Jawaban

bayangan hasil dilatasi tersebut adalah 6y = 12x– 35

bayangan hasil dilatasi tersebut adalah 6y = 12x – 35

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Pembahasan

Gunakan cara Acar GanTung. A mbil sembarang titik pada garis 3 y = 6 x – 1 , misalnya A( x , y) . Car i bayangan titik hasil dilatasi. Diketahui pusat dilatasi adalah P ( a , b) =P ( 0,–4) dan skala faktor . Maka : Sehingga, Dan Gan ti dan hi tung nilai x dan y pada persamaan 3y = 6 x –1. Jadi bayangan hasil dilatasi tersebut adalah 6y = 12x– 35

Gunakan cara Acar GanTung.

Ambil sembarang titik pada garis 3= 6x – 1, misalnya A(x,y).

Cari bayangan titik hasil dilatasi.

Diketahui pusat dilatasi adalah P (a,b) =P (0,–4) dan skala faktor begin mathsize 14px style left parenthesis straight k right parenthesis equals negative 1 half end style. Maka :

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight a equals cell 0 space end cell row straight b equals cell negative 4 space end cell row straight k equals cell negative 1 half end cell end table end style 

Sehingga,

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight y equals cell fraction numerator straight y to the power of apostrophe minus straight b over denominator straight k end fraction plus straight b end cell row straight y equals cell fraction numerator straight y to the power of apostrophe minus left parenthesis negative 4 right parenthesis over denominator negative begin display style 1 half end style end fraction minus 4 end cell row straight y equals cell fraction numerator straight y to the power of apostrophe plus 4 over denominator negative begin display style 1 half end style end fraction minus 4 end cell row cell negative 1 half cross times straight y end cell equals cell negative 1 half cross times open parentheses fraction numerator straight y to the power of apostrophe plus 4 over denominator negative begin display style 1 half end style end fraction minus 4 close parentheses end cell row cell negative 1 half cross times straight y end cell equals cell negative 1 half cross times open parentheses fraction numerator straight y to the power of apostrophe plus 4 over denominator negative begin display style 1 half end style end fraction minus 4 close parentheses minus 1 half cross times left parenthesis negative 4 right parenthesis end cell row cell negative 1 half straight y end cell equals cell left parenthesis straight y to the power of apostrophe plus 4 right parenthesis plus 2 end cell row cell negative 1 half straight y end cell equals cell straight y to the power of apostrophe plus 6 end cell row straight y equals cell negative 2 straight y to the power of apostrophe minus 12 end cell end table end style 

Dan

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row straight x equals cell fraction numerator straight x to the power of apostrophe minus straight a over denominator straight k end fraction plus straight a end cell row straight x equals cell fraction numerator straight x to the power of apostrophe minus 0 over denominator negative begin display style 1 half end style end fraction minus 0 end cell row straight x equals cell fraction numerator straight x to the power of apostrophe over denominator negative begin display style 1 half end style end fraction end cell row straight x equals cell negative 2 straight x apostrophe end cell end table end style 

Ganti dan hitung nilai x dan y pada persamaan 3y = 6 x – 1.

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell 3 straight y end cell equals cell 6 straight x minus 1 end cell row cell 3 left parenthesis negative 2 straight y to the power of apostrophe minus 12 right parenthesis end cell equals cell 6 left parenthesis negative 2 straight x to the power of apostrophe right parenthesis minus 1 end cell row cell negative 6 straight y to the power of apostrophe minus 36 end cell equals cell negative 12 straight x to the power of apostrophe minus 1 end cell row cell negative 6 straight y to the power of apostrophe end cell equals cell negative 12 straight x to the power of apostrophe minus 1 plus 36 end cell row cell negative 6 straight y to the power of apostrophe end cell equals cell negative 12 straight x to the power of apostrophe plus 35 end cell row cell 6 straight y to the power of apostrophe end cell equals cell 12 straight x apostrophe minus 35 end cell end table end style 

Jadi bayangan hasil dilatasi tersebut adalah 6y = 12x – 35

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