Roboguru

Diketahui space straight P equals open parentheses table row cell 2 straight a plus straight b end cell straight c row 10 cell negative 3 end cell end table close parentheses comma space straight Q equals open parentheses table row 5 cell straight a plus straight b end cell row cell 5 straight a end cell cell negative 3 end cell end table close parentheses comma space dan space straight R equals space open parentheses table row 10 straight b row 20 cell negative 6 end cell end table close parentheses.  Nilai space dari space straight a plus straight b space yang space memenuhi space straight P plus straight Q equals straight R space adalah space....

  1. 7

  2. 6

  3. 5

  4. 4

  5. 3

Jawaban:

Diketahui space straight P plus straight Q equals straight R  open parentheses table row cell 2 straight a plus straight b end cell straight c row 10 cell negative 3 end cell end table close parentheses plus open parentheses table row 5 cell straight a plus straight b end cell row cell 5 straight a end cell cell negative 3 end cell end table close parentheses equals space open parentheses table row 10 straight b row 20 cell negative 6 end cell end table close parentheses  open parentheses table row cell 2 straight a plus straight b plus 5 end cell cell space space space straight c plus straight a plus straight b end cell row cell 10 plus 5 straight a end cell cell negative 3 minus 3 end cell end table close parentheses equals space open parentheses table row 10 straight b row 20 cell negative 6 end cell end table close parentheses    Samakan space elemen space matriks space yang space seletak space di space ruas space kiri space dan space kanan comma space didapat space 2 space persamaan space colon  10 plus 5 straight a equals 20  5 straight a equals 20 minus 10  5 straight a equals 10  straight a equals 2    Substitusikan space hasilnya space ke space persamaan space lainnya  2 straight a plus straight b plus 5 equals 10  2 left parenthesis 2 right parenthesis plus straight b plus 5 equals 10  4 plus straight b plus 5 equals 10  9 plus straight b equals 10  straight b equals 10 minus 9  straight b equals 1    Jadi space straight a plus straight b equals 2 plus 1 equals 3

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