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Diketahui titik ( 6 , 2 ) . Tentukan bayangan titik tersebut jika dicerminkan terhadap garis y = 3 ​ x .

Diketahui titik . Tentukan bayangan titik tersebut jika dicerminkan terhadap garis .

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H. Endah

Master Teacher

Mahasiswa/Alumni Universitas Negeri Yogyakarta

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Jawaban

bayangan titik tersebut jika dicerminkan terhadap garis adalah .

 bayangan titik tersebut jika dicerminkan terhadap garis begin mathsize 14px style y equals square root of 3 x end style adalah begin mathsize 14px style open parentheses negative 3 plus square root of 3 comma 3 square root of 3 plus 1 close parentheses end style.

Pembahasan

Refleksi terhadap garis adalah: Diketahui garis , maka . Bayangan titik tersebut jika dicerminkan terhadap garis , didapatkan: Jadi,bayangan titik tersebut jika dicerminkan terhadap garis adalah .

Refleksi terhadap garis begin mathsize 14px style y equals m x end style adalah:

begin mathsize 14px style open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses equals open parentheses table row cell fraction numerator 1 minus m squared over denominator 1 plus m squared end fraction end cell cell fraction numerator 2 m over denominator 1 plus m squared end fraction end cell row cell fraction numerator 2 m over denominator 1 plus m squared end fraction end cell cell negative fraction numerator 1 minus m squared over denominator 1 plus m squared end fraction end cell end table close parentheses open parentheses table row x row y end table close parentheses end style 

Diketahui garis begin mathsize 14px style y equals square root of 3 x end style, maka begin mathsize 14px style m equals square root of 3 end style.

Bayangan titik tersebut jika dicerminkan terhadap garis begin mathsize 14px style y equals square root of 3 x end style, didapatkan:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell fraction numerator 1 minus left parenthesis square root of 3 right parenthesis squared over denominator 1 plus left parenthesis square root of 3 right parenthesis squared end fraction end cell cell fraction numerator 2 left parenthesis square root of 3 right parenthesis over denominator 1 plus left parenthesis square root of 3 right parenthesis squared end fraction end cell row cell fraction numerator 2 left parenthesis square root of 3 right parenthesis over denominator 1 plus left parenthesis square root of 3 right parenthesis squared end fraction end cell cell negative fraction numerator 1 minus left parenthesis square root of 3 right parenthesis squared over denominator 1 plus left parenthesis square root of 3 right parenthesis squared end fraction end cell end table close parentheses open parentheses table row 6 row 2 end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell fraction numerator 1 minus 3 over denominator 1 plus 3 end fraction end cell cell fraction numerator 2 square root of 3 over denominator 1 plus 3 end fraction end cell row cell fraction numerator 2 square root of 3 over denominator 1 plus 3 end fraction end cell cell negative fraction numerator 1 minus 3 over denominator 1 plus 3 end fraction end cell end table close parentheses open parentheses table row 6 row 2 end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell fraction numerator negative 2 over denominator 4 end fraction end cell cell fraction numerator 2 square root of 3 over denominator 4 end fraction end cell row cell fraction numerator 2 square root of 3 over denominator 4 end fraction end cell cell 2 over 4 end cell end table close parentheses open parentheses table row 6 row 2 end table close parentheses end cell row cell open parentheses table row cell x apostrophe end cell row cell y apostrophe end cell end table close parentheses end cell equals cell open parentheses table row cell negative 3 plus square root of 3 end cell row cell 3 square root of 3 plus 1 end cell end table close parentheses end cell end table end style

Jadi, bayangan titik tersebut jika dicerminkan terhadap garis begin mathsize 14px style y equals square root of 3 x end style adalah begin mathsize 14px style open parentheses negative 3 plus square root of 3 comma 3 square root of 3 plus 1 close parentheses end style.

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