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3x-y=9
eliminasi
8x=16
x=2
subtitusi
5(2)+y=7
10+y=7
y=-3
3x-y=9 ----> -y=-3x+9
y=3x-9
5x+y=7
5x+3x-9=7
8x-9=7
8x=7+9
8x=16
x=16/8
x=2
x=2 -----> y=3x-9
y=3.2-9
y=6-9
y=-3
Nilai dari x+y=...
2+(-3)=
2-3= -1