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Pertanyaan

Jika 2 x − y = − 1 , 3 x − 2 y = − 3 , a x − 2 y = 4 b , dan 4 x − a y = 2 b , maka a + b = ....

Jika  dan , maka a + b = ....

  1. 0

  2. 1

  3. 2

  4. 3

  5. 4

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M. Robo

Master Teacher

Jawaban terverifikasi

Jawaban

a + b = 2 + (-1) = 1

a + b = 2 + (-1) = 1

Pembahasan

Kemudian dan Subtitusi persamaan (1) ke persamaan (2): Lalu Jadi, a + b = 2 + (-1) = 1

begin mathsize 14px style table row cell 2 x minus y equals negative 1 end cell row cell 3 x minus 2 y equals negative 3 end cell end table open vertical bar table row cell cross times 2 end cell row cell cross times 1 end cell end table close vertical bar table row cell 4 x minus 2 y equals negative 2 end cell blank row cell bottom enclose 3 x minus 2 y equals negative 3 end enclose end cell minus 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 x equals 1 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 3 end style

Kemudian

begin mathsize 14px style a left parenthesis 1 right parenthesis minus 2 left parenthesis 3 right parenthesis equals 4 b space a minus 6 equals 4 b space a minus 4 b equals 6 space a equals 4 b plus 6 horizontal ellipsis horizontal ellipsis horizontal ellipsis left parenthesis 1 right parenthesis end style

dan

begin mathsize 14px style 4 left parenthesis 1 right parenthesis minus a left parenthesis 3 right parenthesis equals 2 b space 4 minus 3 a equals 2 b space 3 a plus 2 b equals 4 horizontal ellipsis horizontal ellipsis horizontal ellipsis left parenthesis 2 right parenthesis end style

Subtitusi persamaan (1) ke persamaan (2):

begin mathsize 14px style 3 left parenthesis 4 b plus 6 right parenthesis plus 2 b equals 4 space 12 b plus 18 plus 2 b equals 4 space 14 b equals negative 14 space b equals negative 1 end style

Lalu

begin mathsize 14px style a equals 4 open parentheses negative 1 close parentheses plus 6 equals 2 end style

Jadi, a + b = 2 + (-1) = 1

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Jika 3 x − 2 y = − 1 , − 2 x + 3 y = 4 , 4 x + b y = 4 b , dan a x + 3 y = 2 a , maka a + b = ....

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