jika p=2x-y+z untuk x,y dan z merupakan penyelesaian sistem persamaan ----x+3y+3z=14 x+3y+3z=16 -2x+3y+z=7 nilai p =.....?

- x + 3y + 3z = 14
x + 3y + 3z = 16
- 2x + 3y + z = 7

- x + 3y + 3z = 14
x + 3y + 3z = 16
____________ —
- 2x = - 2
x = 1

x + 3y + 3z = 16
1 + 3y + 3z = 16
3y + 3z = 16 - 1
3y + 3z = 15
y + z = 5
y = 5 - z

- 2x + 3y + z = 7
- 2 + 3(5 - z) + z = 7
- 2 + 15 - 3z + z = 7
- 2z = 7 + 2 - 15
- 2z = 9 - 15
- 2z = - 6
z = 3

y = 5 - z
y = 5 - 3
y = 2

p = 2x - y + z
p = 2 - 2 + 3
p = 3

Maaf Kalau Salah