Hp dari sistem persamaan x+3y-z= 3 x+2y+3z= -2 x+y-z=1

X + 3y – z = 3
x + 2y + 3z = – 2
————————-(-)
y – 4z = 5 … pers 1

x + 2y + 3z = – 2
x + y – z = 1
————————(-)
y + 4z = – 3 … pers 2

pers 1 & 2
y – 4z = 5
y + 4z = – 3
—————-(-)
– 8z = 8
z = – 1

y – 4z = 5
y – 4(-1) = 5
y + 4 = 5
y = 5 – 4 = 1

x + y – z = 1
x + 1 – (-1) = 1
x + 2 = 1
x = 1 – 2 = – 1