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Verified answer
Dari matriks tsb. didapat:3a + 2b = 1 (i)
0.a + (-1)b = -1
-b = -1
b = 1
(-2)a + 5b = c
-2a + 5b = c (ii)
Masukkan nilai b ke persamaan (i)
3a + 2b = 1
3a + 2(1) = 1
3a + 2 = 1
3a = -1
a = -1/3
Masukkan nilai a dan b ke persamaan (iii)
-2a + 5b = c
-2(-1/3) + 5(1) = c
c = 2/3+ 5
c = 2/3 + 15/3
c = 17/3
a + ab + abc
= -1/3 + (-1/3)(1) + (-1/3)(1)(17/3)
= -1/3 - 1/3 - 17/9
= -2/3 - 17/9
= -6/9 - 17/9
= -23/9
*tidak ada di pilihan jawaban*