Question

Diketahui x-ry=5 , 2x+3z =12, y+2z =3. niali x+y+z adalah

Answer 1

X-2y=5
2x+3z=12
y+2z=3
eliminasi:
2(x-2y)=2(5)-2x+3z=12
2x-4y=10-(2x+3z=12)
-4y-3z=-2...(1)
4(y+2z=3)=4y+8z=12

4y+8z=12+(-4y-3z=-2)
5z=10
z=2....(2)
y+2z=3
y=3-2(2)=-1.......(3)
2x+3z=12
2x=12-3(2)
x=3....(4)

x+y+z=3+(-1)+2=4