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Fungsi f ( x , y ) = 2 x + 2 y − 5 yang didefinisikan pada daerah yang diarsir, mencapai minimum pada...

Fungsi  yang didefinisikan pada daerah yang diarsir, mencapai minimum pada... 

  1. titik straight D

  2. titik straight C

  3. titik straight B

  4. titik straight A

  5. titik left parenthesis 1 comma 2 right parenthesis

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G. Albiah

Master Teacher

Mahasiswa/Alumni Universitas Galuh Ciamis

Jawaban terverifikasi

Pembahasan

Dengan memperhatikan grafik diketahui bahwa : Karena arsiran berada di atas garis, maka dan titiknya Karena arsiran berada di bawah garis, maka dan titiknya . Karena arsir berada di atas garis maka . Karena arsir berada di bawah garismaka . Kemudian mencari titik potong a. dan b. dan c. dan d. dan Gambar grafik, Di dapatkan titik , , dan . Subtitusikan ke fungsi . Di dapatkan fungsi mencapai minimum saat di titik karena nilai fungsinya . Oleh karena itu, jawaban yang benar adalah D.

Dengan memperhatikan grafik diketahui bahwa :

table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 4 space dan space y equals 2 end cell row cell 2 x plus 4 y end cell equals cell 2 times 4 end cell row cell 2 x plus 4 y end cell equals 8 row cell x plus 2 y end cell equals 4 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell x plus 2 y end cell equals 4 row x equals cell 0 rightwards arrow y equals 2 end cell row y equals cell 0 rightwards arrow x equals 4 end cell row blank blank cell left parenthesis 0 comma 2 right parenthesis comma left parenthesis 4 comma 0 right parenthesis end cell end table

Karena arsiran berada di atas garis, maka x plus 2 y greater or equal than 4 dan titiknya left parenthesis 0 comma 2 right parenthesis comma left parenthesis 4 comma 0 right parenthesis

table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 4 space dan space y equals 4 end cell row cell 4 x plus 4 y end cell equals cell 4 times 4 end cell row cell 4 x plus 4 y end cell equals 16 row cell x plus y end cell equals 4 end table

table attributes columnalign right center left columnspacing 0px end attributes row cell x plus y end cell equals 4 row x equals cell 0 rightwards arrow y equals 4 end cell row y equals cell 0 rightwards arrow x equals 4 end cell row blank blank cell left parenthesis 0 comma 4 right parenthesis comma left parenthesis 4 comma 0 right parenthesis end cell end table

Karena arsiran berada di bawah garis, maka x plus y less or equal than 4 dan titiknya left parenthesis 0 comma 4 right parenthesis comma left parenthesis 4 comma 0 right parenthesis.

table attributes columnalign right center left columnspacing 0px end attributes row x equals cell 1 space dan space y equals negative 2 end cell row cell negative 2 x plus y end cell equals cell negative 2 cross times 1 end cell row cell negative 2 x plus y end cell equals cell negative 2 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell negative 2 x plus y end cell equals cell negative 2 end cell row x equals cell 0 rightwards arrow y equals negative 2 end cell row y equals cell 0 rightwards arrow x equals 1 end cell row blank blank cell left parenthesis 0 comma negative 2 right parenthesis comma left parenthesis 1 comma 0 right parenthesis end cell end table

Karena arsir berada di atas garis maka negative 2 x plus y greater or equal than negative 2.

table attributes columnalign right center left columnspacing 0px end attributes row x equals cell negative 2 space dan space y equals 2 end cell row cell 2 x minus 2 y end cell equals cell negative 2 cross times 2 end cell row cell 2 x minus 2 y end cell equals cell negative 4 end cell row cell x minus y end cell equals cell negative 2 end cell end table

table attributes columnalign right center left columnspacing 0px end attributes row cell negative 2 x plus y end cell equals cell negative 2 end cell row x equals cell 0 rightwards arrow y equals negative 2 end cell row y equals cell 0 rightwards arrow x equals 1 end cell row blank blank cell left parenthesis 0 comma negative 2 right parenthesis comma left parenthesis 1 comma 0 right parenthesis end cell end table

Karena arsir berada di bawah garis maka x minus y greater or equal than negative 2.

Kemudian mencari titik potong 

a. x minus y greater or equal than negative 2 dan x plus 2 y greater or equal than 4

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator x plus 2 y equals 4 x minus y equals negative 2 minus over denominator 3 y equals 6 end fraction end cell row y equals cell 6 divided by 3 end cell row y equals 2 row cell x minus y end cell equals cell negative 2 end cell row cell x minus 2 end cell equals cell negative 2 end cell row x equals cell negative 2 plus 2 end cell row x equals 0 row blank blank cell left parenthesis 0 comma 2 right parenthesis end cell row blank blank blank end table

b. x plus y less or equal than 4 dan negative 2 x plus y greater or equal than negative 2

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator x plus y equals 4 minus 2 x plus y equals negative 2 minus over denominator 3 x equals 6 end fraction end cell row x equals cell 6 divided by 3 end cell row x equals 2 row cell x plus y end cell equals 4 row cell 2 plus y end cell equals 4 row y equals cell 4 minus 2 end cell row y equals 2 row blank blank cell left parenthesis 2 comma 2 right parenthesis end cell row blank blank blank end table

c. negative 2 x plus y greater or equal than negative 2 dan x plus 2 y greater or equal than 4

table attributes columnalign right center left columnspacing 0px end attributes row cell x plus 2 y end cell equals cell 4 rightwards arrow dikali space 2 end cell row cell negative 2 x plus y end cell equals cell negative 2 end cell row blank blank blank row blank blank cell fraction numerator 2 x plus 4 y equals 8 minus 2 x plus y equals negative 2 plus over denominator 5 y equals 6 end fraction end cell row y equals cell 6 over 5 end cell row cell x plus 2 y end cell equals 4 row cell x plus 2 open parentheses 6 over 5 close parentheses end cell equals 4 row cell x plus 12 over 5 end cell equals 4 row x equals cell 4 minus 12 over 5 end cell row x equals cell 20 over 5 minus 12 over 5 end cell row x equals cell 8 over 5 end cell row blank blank cell open parentheses 8 over 5 comma 6 over 5 close parentheses end cell row blank blank blank end table

d. x plus y less or equal than 4 dan x minus y greater or equal than negative 2

table attributes columnalign right center left columnspacing 0px end attributes row blank blank cell fraction numerator x plus y equals 4 x minus y equals negative 2 plus over denominator 2 x equals 2 end fraction end cell row x equals 1 row cell x plus y end cell equals 4 row cell 1 plus y end cell equals 4 row y equals cell 4 minus 1 end cell row y equals 3 row blank blank cell left parenthesis 1 comma 3 right parenthesis end cell row blank blank blank end table

Gambar grafik,

Di dapatkan titik straight A open parentheses 0 comma 2 close parenthesesstraight B open parentheses 1 comma 3 close parenthesesstraight C open parentheses 2 comma 2 close parentheses dan straight D open parentheses 8 over 5 comma 6 over 5 close parentheses. Subtitusikan ke fungsi f left parenthesis x comma y right parenthesis equals 2 x plus 2 y minus 5.

table attributes columnalign right center left columnspacing 0px end attributes row cell f left parenthesis x comma y right parenthesis end cell equals cell 2 x plus 2 y minus 5 end cell row cell f left parenthesis 0 comma 2 right parenthesis end cell equals cell 2 open parentheses 0 close parentheses plus 2 left parenthesis 2 right parenthesis minus 5 end cell row blank equals cell 0 plus 4 minus 5 end cell row blank equals cell 0 minus 1 end cell row blank equals cell negative 1 end cell row cell f left parenthesis 1 comma 3 right parenthesis end cell equals cell 2 open parentheses 1 close parentheses plus 2 left parenthesis 3 right parenthesis minus 5 end cell row blank equals cell 1 plus 6 minus 5 end cell row blank equals cell 7 minus 5 end cell row blank equals 2 row cell f left parenthesis 2 comma 2 right parenthesis end cell equals cell 2 open parentheses 2 close parentheses plus 2 left parenthesis 2 right parenthesis minus 5 end cell row blank equals cell 4 plus 4 minus 5 end cell row blank equals cell 8 minus 5 end cell row blank equals 3 row cell f open parentheses 8 over 5 comma 6 over 5 close parentheses end cell equals cell 2 open parentheses 8 over 5 close parentheses plus 2 open parentheses 6 over 5 close parentheses minus 5 end cell row blank equals cell 16 over 5 plus 12 over 5 minus 5 end cell row blank equals cell 28 over 5 minus 5 end cell row blank equals cell 28 over 5 minus 25 over 5 end cell row blank equals cell 3 over 5 end cell end table

Di dapatkan fungsi mencapai minimum saat di titik straight A open parentheses 0 comma 2 close parentheses karena nilai fungsinya negative 1.


Oleh karena itu, jawaban yang benar adalah D.

 

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