Diketahui matriks A = (x 1 2 4 3 5), B = (y 4 1 4 5 x), G = (9 13 5 16 18 14)

by

Jika A + 3B = C maka nilai xy yaitu

6
Pembahasan:
A + 3B = C
⎧x 1 2⎫ + 3⎧y 4 1⎫ = ⎧9   13   5⎫
⎩4 3 5⎭      ⎩4 5 x⎭    ⎩16 18 14⎭
⎧x+3y 13       5⎫ = ⎧9    13  5⎫
⎩16    18  5+3x⎭   ⎩16 18 14⎭
5 + 3x = 14
3x = 14 – 5
3x = 9
x = 3
x + 3y = 9
3 + 3y = 9
3y = 9 – 3
3y = 6
y = 2
xy = 3 × 2
     = 6
  Varians dari data 1,1,2,3,4,5,7,9