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Tidak mempunyai invers jika determinan = 0Untuk mencari determinan matriks berordo 3 x 3 kita gunakan cara sarrus
|s ... 6 ... t| .. s .. 6
|2 .. 1 .... 6| .. 2 .. 1
|1 ... 2 ... 3| .. 1 ... 2
Det = (s.1.3 + 6.6.1 + t.2.2) - (t.1.1 + s.6.2 + 6.2.3)
0 = (3s + 36 + 4t) - (t + 12s + 36)
0 = 3s + 36 + 4t - t - 12s - 36
0 = 3t - 9s
9s = 3t
t = 3s
y = 3x
0 = (3s + 36 + 4t) - (t + 12s + 36)
0 = 3s + 36 + 4t - t - 12s - 36
0 = 3t - 9s
9s = 3t
t = 9s/3
t = 3s
A. Y = 3x