tugas nih buat nanti X+y=7 X-y=8

x+y = 7
x-y = 8
_______+
2x = 15
x = 15/2

subtitusi x

x+y = 7
15/2 +y = 7
y= 7-15/2
y= 14/2-15/2
y= -1/2

2y = 15
y= 7,5


x+y = 7
x = 7 - 7,5
x = -0,5