Question

Eliminasi dan subtitusikan
X-y+2z = 5
2x+y-z = 9
X-2y-3z = 4

Answer 1

X-y+2z=5
2x+y-z=9
x-2y-3z=4

gabungan eliminasi &subtitusi ;

eliminasi ;
x-y+2z=5}×2
2x+y-z=9}×1

2x-2y+4z=10
2x+y-z=9
________-
-3y+5z=1

x-y+2z=5
x-2y-3z=4
________-
y+5z=1

-3y+5z=1
y+5z=1
_______-
-4y=0
y=0

subtitusi ;
y+5z=1
5z=1-y
z=(1-y)/5
z=(1-0)/5
z=1/5

x-y+2z=5
x-0+2.(1/5)=5
x=5+0-2/5
x=25/5+0/5-2/5
x=23/5

semoga dapat membantu,,,,,

R★7
♪♥♪