maka nilai x +y+z tolong dengan cara mengerjakannya yha kak

x + y/2 = 10 > dikalikan 1/4
y/4 - z = -2 > dikalikan 1/2
Hasilnya:
1/4x - 1/2z = 3/2
Hasil diatas dikurangi x/3 + z/2
Hasilnya: -1/2x=5/2.
Jadi x= 5/2 : -1/12 =5/2.(-12) = -30.
Mencari Y:
x+y/2=10.
(-30)+y/2=10
y/2=10+30
y=40:1/2=20.
Mencari Z
Z/2+x/3=4
Z/2+1/3.(-30)=4
Z/2+(-10)=4
Z/2=4+10
Z=14:1/2=14.2=28
Jadi x+y+z= (-30)+20+28=18 (B)

1. x+y/2 = 10
2(x+y/2) = 2x10
2x +y = 20

2. y/4 - z= -2
4(y/4 -z) = 4(-2)
y -4z = -8

3. z/2 + x/3 =4
3z/6 + 2x/6 = 4
6(3z/6 + 2x/6) =6(4)
3z + 2x = 24

persamaan 1 dan 2 =
2x + y = 20
y = 20 - 2x

y - 4z = -8
(20-2x) - 4z = -8
20+8 = 2x+4z
2x+ 4z = 28

4z+2x = 28
3z+ 2x = 24
__________ _
z +0 = 4
z = 4


y -4z = -8
y -4(4) = -8
y-16 = -8
y = 16-8
y = 8

2x + y = 20
2x + 8 = 20
2x = 20-8
2x = 12
x = 12/2
x = 6


maka x+y+z = 6+8+4 = 18

B. 18