x²+3y²=31 | *2
2x²+6y²=31x
62-31x=0 x=2
4+3y²=31
3y²=27 y²=9
y=±3
x1=2 y1=3
x2=2 y2=-3
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x²+3y²=31 | *2
2x²+6y²=31x
62-31x=0 x=2
4+3y²=31
3y²=27 y²=9
y=±3
x1=2 y1=3
x2=2 y2=-3