Nila (x - y ) dari sistem persamaan linear. x + y + z = 2 3y - 4y = -5 6z = 3

x + y + z = 2 ...(1)

3y - 4y = -5
-y = -5
y = 5 ...(2)

6z = 3
z = 1/2 ...(3)

subs 3 dan 2 ke 1 untuk mengetahui x

x + 5 + 1/2 = 2
x = 2 - 11/2
x = -7/2

jadi, x - y = -7/2 - 5
= -17/2

6z = 3
z = 3/6
z = 1/2

3y-4y = -5
-y = -5
y = 5

x + y + z = 2
x + 5 + 1/2 = 2
x + 5 1/2 = 2
x = 2 - 5 1/2
x = - 3 1/2

Maka

x - y = - 3 1/2 - 5 = -8 ½

Semoga bermanfaat