Apabila B – A = Cᵗ & Cᵗ = transpose matriks C maka nilai x . y =
20
Pembahasan:
B – A = Cᵗ
⎛x+y 2⎞ _ ⎛2 -1⎞ = ⎛7 3⎞
⎝3 y⎠ ⎝1 4⎠ ⎝2 1⎠
⎛x+y-2 2+1⎞ = ⎛7 3⎞
⎝3–1 y–4⎠ ⎝2 1⎠
⎛x+y-2 3⎞ = ⎛7 3⎞
⎝2 y-4⎠ ⎝2 1⎠
y – 4 = 1
y = 5
x + y – 2 = 7
x + 5 – 2 = 7
x = 4
Kaprikornus, x . y = 4 × 5 = 20