Page 7 - Wahyu Wardaningsih_Bahan Ajar 3

Kedua, kita tentukan nilai D, Dx, Dy dan Dz dengan ketentuan seperti pada langkah-langkah
di atas.

■ Menentukan nilai D

2 1 1 2 1

D = 1 2 −1 1 2

3 −1 1 3 −1

D = [(2)(2)(1) + (1)(−1)(3) + (1)(1)(−1)] – [(3)(2)(1) + (−1)(−1)(2) + (1)(1)(1)]

D = [4 – 3 – 1] − [6 + 2 + 1]

D = 0 − 9

D = −9

■ Menentukan nilai Dx

12 1 1 12 1

Dx = 3 2 −1 3 2

11 −1 1 11 −1

Dx = [(12)(2)(1) + (1)(−1)(11) + (1)(3)(−1)] – [(11)(2)(1) + (−1)(−1)(12) + (1)(3)(1)]

Dx = [24 – 11 – 3] − [22 + 12 + 3]
Dx = 10 − 37

Dx = −27

■ Menentukan nilai Dy

2 12 1 2 12

Dy = 1 3 −1 1 3

3 11 1 3 11

Dy = [(2)(3)(1) + (12)(−1)(3) + (1)(1)(11)] – [(3)(3)(1) + (11)(−1)(2) + (1)(1)(12)]

Dy = [6 – 36 + 11] − [9 − 22 + 12]

Dy = −19 – (–1)

Dy = −18

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