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Materi : Matriks



No. 2

p - q = 16 ...............(1)
q + r = 2 .................(2)
3s + r = 14 ..............(3)
2p - 4s = 12 ..............(4)

dari (1) dan (2)

p - q       = 16
     q + r  = 2
-------------------- (+)
p + r = 18 .....................(5)

dari (5) dan (4)
p + r = 18
p - 2s = 6
-------------- (-)
3s = 12
s = 4

subtitusikan s ke 
p - 2s = 6
p - 2(4) = 6
p = 6 + 8
p = 14

subtitusikan p ke
p - q = 16
14 - q = 16
q = 14 - 16
q = -2

subtitusikan q ke
q + r = 2
-2 + r = 2
r = 2 + 2
r = 4

jadi nilai (p,q,r,s) = (14, -2, 4, 4)


No. 3

(p + 2) + p = 4
2p + 2 = 4
2p = 2
p = 1

5 + (q + 3) = 5
q + 3 = 0
q = -3

jadi nilai (p,q) = (1,-3)