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Kita eliminasi (1) & (2)
a+b+c =5 |x2| 2a+2b+2c=10
2a-3b-4c=-11 |x1| 2a-3b-4c=-11
___________-
5b+6c=21...(4)
Kita eliminasi (1) & (3)
a+b+c=5 |x3| 3a+3b+3c=15
3a-2b-c=-6 |x1| 3a-2b-c =-6
___________-
5b+4c=21...(5)
Kita eliminasi (4) & (5)
5b+6c=21
5b+4c=21
________-
2c=0 ⇒ c=0
Kita substitusikan c=0 ke (4)
5b+6.0=21 ⇒ 5b=21 ⇒ b=21/5
Kita substitusikan c=0 dan b=21/5 ke (1)
a+b+c=5 ⇒ a=5-b-c ⇒ a=5-21/5-0 ⇒ a=25/5-21/5 ⇒ a=4/5
Jadi HP={(4/5,21/5,0)}
Semangat!