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2.8：直线对 - Coggle Diagram
2.8：直线对
两条直线相乘
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\[l:ax^2+2hxy+by^2+2gx+2fy+c=0{\color{red}{\rightleftharpoons}}\begin{vmatrix}a&h&g\\h&b&f\\g&f&c\end{vmatrix}=0\]
\[直线对上任意一点P(x_1,y_1)，满足\]
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\[l:ax^2+2hxy+by^2=0代表一条经过(0,0)的直线\]
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