Diketahui [(2 3)(6 x)]+[(1 y)(3 5)]=[(3 7)(9 6)]. Nilai x+3y=... a. 4 b. 8 c. 7 d. 5 e. 9

Jawaban yang benar adalah 13. Sifat : Jika matriks A = [(a b) (c d)] dan matriks B = [(k l) (m n)], maka : A + B = [(a+k b+l) (c+m d+n)] A = B dengan a = k, b =l, c = m, d = n [(2 3) (6 x)] + [(1 y) (3 5)] = [(3 7) (9 6) [(2+1 3+y) (6+3 x+5)] = [(3 7) (9 6)] [(3 3+y) (9 x+5)] = [(3 7) (9 6)] • 3 + y = 7 y = 4 • x + 5 = 6 x = 1 Sehingga, x + 3y = 1 + 3(4) = 1 + 12 = 13 Jadi, nilai x + 3y = 13.