x+y+z=2 dan 3x+2y-5z=4 dan 5x+4y-2z=3
Matematika
mymi
Pertanyaan
x+y+z=2 dan 3x+2y-5z=4 dan 5x+4y-2z=3
1 Jawaban
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1. Jawaban auliaR
x + y + z = 2.........(1)
3x + 2y - 5z = 4.........(2)
3x + 2y - 2z = 3........(3)
(1).....x + y + z = 2 (3) 3x + 3y + 3z = 6
(2).....3x + 2y - 5z =4 (1) 3x + 4y - 5z = 4
⇒ y + 8z = 2.......(4)
(1).....x + y + z = 2 (3) 3x + 3y + 3z = 6
(3).....3x + 2y - 2z = 3 (1) 3x + 4y - 2z = 3
⇒ -y + 5z = 3........(5)
(4)..... y + 8z = 2
(5)..... -y + 5z = 3
⇒ 13z = 5
z = 5/13......(6)
(6) subtitusikan ke (4) y + 8(5/13) = 2
y = -14/13.........(7)
(6) (7) subtitusikan ke (1) x + y + z = 2
x + -14/13 + 5/13 = 2
x = 35/13