tentukan hasil himpunan dari SPLTV...

pers 1&2
2x+y-z=1 |×1| 2×+y-z=1
x-y+z=5 |×2| 2x-2y+2z=10
=3y-3z=-9 .....(4)

persamaan 2&3
x-y+z=5 |×3| 3x-3y+3z=15
3x+2y+2z=24 |×1| 3x+2y+2z=24
=-5y+z=-9...... (5)

pers 4&5
3y-3z=-9 |×5| 15y-15z=45
-5y+z=-9 |×3| -15y+3z=27
=12z=72
z=72÷2
z=6

subsitusi ke pers 4

3y-3(6)=-9
3y-18=-9
3y=-9+18
3y=9
y=9÷3
y=3

subsitusi ke pers 1
2x+y-z =1
2x+3-6=1
2x-6=1-3
2x-6=-2
2x=-2+6
2x=4
x=4÷2
x=2

hp {2,3,4}