2x-3=y xy=209

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2x-3=y xy=209
2x-3=y xy=209

2x-3=y xy=209
2x-3=y a
xy=209 b
将a式代入b式得：
x(2x-3)=209
(2x+19)(x-11)=0
x=-19/2 或x=11

X*(2X-3)=209
2X^2-3X-209=0
X1=-19/2 X2=11
Y1=-22 Y2=19

X1=11，Y1=19;X2=-19/2，Y2=-22

把2x-3=y代入xy=209
x(2x-3)=209
x1=11 y1=19
x2=-9.5 y2=-22

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