2x+3y-2z=9 5x-2y=16 Dan y=-3 maka nilai x+y+z

Y= -3                       x + y + z = 2 + -3 + -7 = -8

5x-2(-3) =16
5x = 16-6
x = 10/5 = 2

2x + 3y -2z = 9
2(2) + 3(-3) -2z = 9
4 -9 -2z = 9
-2z = 9 + 5
-2z = 14
z = -7

5x-2y=16
5x-2(-3)=16
5x+6=16
5x=16-6
5x=10
x=10/5
x=2
2x+3y-2z=9
2(2)+3(-2)-2z=9
4-6-2z=9
-2-2z=9
-2z=9+2
-2z=7
z=-7/2
x+y+z= 2 – 3 – 7/2
= – 9/2