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Diketahui a ⇀ = 3 i − 2 j ​ , b ⇀ = − i + 4 j ​ dan r ⇀ = 7 i − 8 j ​ . Jika r ⇀ = m a ⇀ + n b ⇀ . Hitunglah m + n .

Diketahui  dan . Jika . Hitunglah .

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A. Salim

Master Teacher

Mahasiswa/Alumni Universitas Pelita Harapan

Jawaban terverifikasi

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 begin mathsize 14px style straight m plus straight n equals 2 minus 1 equals 1 end style.

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Pembahasan

Konsep Perkalian skala dengan vektor dan kesamaan 2 vektor: Dari kesamaan 2 vektor diperoleh: Persamaan dan . Dengan metode eliminasi - substitusi: Jadi, .

Konsep Perkalian skala dengan vektor dan kesamaan 2 vektor:

begin mathsize 14px style table attributes columnalign right center left columnspacing 0px end attributes row cell straight r with rightwards harpoon with barb upwards on top end cell equals cell straight m straight a with rightwards harpoon with barb upwards on top plus straight n straight b with rightwards harpoon with barb upwards on top end cell row cell 7 straight i minus 8 straight j end cell equals cell straight m left parenthesis 3 straight i minus 2 straight j right parenthesis plus straight n left parenthesis negative straight i plus 4 straight j right parenthesis end cell row cell open parentheses table row 7 row cell negative 8 end cell end table close parentheses end cell equals cell straight m open parentheses table row 3 row cell negative 2 end cell end table close parentheses plus straight n open parentheses table row cell negative 1 end cell row 4 end table close parentheses end cell row cell open parentheses table row 7 row cell negative 8 end cell end table close parentheses end cell equals cell open parentheses table row cell 3 straight m end cell row cell negative 2 straight m end cell end table close parentheses plus open parentheses table row cell negative straight n end cell row cell 4 straight n end cell end table close parentheses end cell row cell open parentheses table row 7 row cell negative 8 end cell end table close parentheses end cell equals cell open parentheses table row cell 3 straight m minus straight n end cell row cell negative 2 straight m plus 4 straight n end cell end table close parentheses end cell end table end style 

Dari kesamaan 2 vektor diperoleh:

Persamaan begin mathsize 14px style 3 straight m minus straight n equals 7 end style dan Error converting from MathML to accessible text. .

Dengan metode eliminasi - substitusi:

begin mathsize 14px style table row cell 3 straight m minus straight n equals 7 rightwards arrow end cell cell 12 straight m minus 4 straight n equals 28 end cell row cell negative 2 straight m plus 4 straight n equals negative 8 rightwards arrow end cell cell negative 2 straight m plus 4 straight n equals negative 8 space plus end cell row blank cell 10 space straight m equals 20 end cell row blank cell straight m equals 2 end cell row blank cell 3 straight m minus straight n equals 7 end cell row blank cell 3 times 2 minus straight n equals 7 end cell row blank cell 6 minus straight n equals 7 end cell row blank cell straight n equals negative 1 end cell end table end style 

Jadi, begin mathsize 14px style straight m plus straight n equals 2 minus 1 equals 1 end style.

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