Tentukan nilai x,y,dan z X = 2y + 1 X + 2z = 7 Z - 3y = -1

x= 2y + 1 ............ pers.1

z - 3y = -1
z =-1 + 3y ........... pers 2

x + 2z =7
masukkan pers 1 dan pers 2
(2y +1) + 2(-1 + 3y) =7
2y +1 - 2 + 6y =7
8y - 1 = 7
8y = 7+1
8y = 8
y =1

oke, kembali k pers 1 dan pers 2
x = 2y + 1 = 2(1) + 1 = 2+1 = 3
z = -1 + 3y = -1 + 3(1) = -1 + 3 = 2