tentukan dgn metode substitusi! x-y=0 y=-x+3x

x-y = 0
y= -x+3x
y= 2x

subtitusi y
x-y= 0
x-2x= 0
-x= 0
x= 0

subtitusi x
x-y= 0
0-y= 0
-y = 0
y= 0