垂直线方程 定义
The equation of a vertical line is x = k, where a represents the x-intercept. The graph below provides an example of the equation of a vertical line.
特性
The equation of a vertical line does not have a y-intecept since a vertical line never crosses the y-axis. If it runs directly through the y-axis (x = 0) then it technically intersects the y-axis and has many y-intercepts.
The slope of a vertical line is undefined because the denominator of the slope (the change in ΔX) is zero.
垂直线有助于确定关系是否是数学中的函数。
垂直线的方程总是采用 x = k 的形式，其中 k 是任意数，k 也是 x 截距。
来源
“Vertical Line.” Math Warehouse, www.mathwarehouse.com/algebra/linear_equation/vertical-line.php.
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