nilai z yg memunihi spltv 2x + y = 4 x + 2z = 3 3y - z = 5 sama dengan

2x + y = 4 ..... (i)
x + 2z = 3.......(ii)
3y - z = 5 .......(iii)


2x + y = 4 (x1)
x + 2z= 3 (x2)


eliminasi

2x + y = 4
2x +4z = 6
--------------- -
y - 4z = -2 ..... (iv)


gunakan persamaan iii dan iv


3y - z = 5 (×1)
y - 4z = -2(x3)



3y - z =5
3y -12z =-6
---------------- -
11z= 11
z = 1