tentukan himpunan penyelesaian dr spltv berikut dngn menggunakan cara metode substitusi 1.x+3y-z= -15 3x+2y+5z=15 2x-y+3z=0

1x + 3y _ 2zip = _15
3x + 2y 5z = 15
2x _y + 3zip = 0
x = ( _ 15 _ 3y + z ) /1

3 ( _15_3y+z) /1 + 2y + 5z= 15
_45 _ 9y + 3z+2y+5z=15
_45 _ 7y + 8z= 15
_7y + 8z= 15 + 45
_7y + 8z= 60

2 ( _15 _ 3y + z ) _y + 3z= 0
_30 _ 6y +2z _ y + 3z = 0
_30 _ 7y +5z= 0
_7y +5z = 30


y = ( 60 _8z) / _7
_7(60 _ 8 z)/ _7 +5z= 30
_420 + 56z _ 35z= _ 210
21z = _ 210 + 420
21z = 210
z = 210 / 21
z = 10

_7y +8 x 10 = 60
_ 7y = 60 _ 80
y = _20 / _ 7
y = 2 6/7

1x + 3 x 2 6/7 + 10 = _15
x = _15 _ 2 6/7 _ 10
x = _195 / 7
= _ 27 6/7