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y=10-3x
x²+y²=10
x²+(10-3x)²=10
x²+100-60x+9x²=10
10x²-60x+90=0
x²-6x+9=0
(x-3)(x-3)=0
x=3
subtitusi ke 3x+y=10
3(3)+y=10
9+y=10
y=1
himpunan penyelesaianya: (3,1)