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(-1,5) ⇒ 5 = a - b + c ...... (i)
(2,4) ⇒ 4 = 4a + 2b + c ....(ii)
(4,0) ⇒ 0 = 16a + 4b + c...(iii)
eliminasi (i) & (ii),
5 = a - b + c
4 = 4a + 2b + c -
1 = -3a -3b .... (iv)
eliminasi (i) & (iii),
4 = 4a + 2b + c
0 = 16a + 4b + c -
4 = -12a - 2b
2 = - 6a - b .... (v)
eliminasi (iv) & (v),
1 = -3a -3b x2 ⇒ 2 = -6a -6b
2 = - 6a - b x1 ⇒ 2 = -6a - b -
0 = - 5b ⇒ b = 0
1 = -3a - 3b
1 = -3a - 0
a =
5 = a - b + c
5 = - - 0 + c
c = 5
maka Y =