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如何求得y轴截距

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某个方程的Y轴截距，表示方程曲线与Y轴相交的点到原点的距离。有很多方式可以找出等式的y轴截距，根据方程不同，方法也不同。

方法 1

方法 1 的 2:

通过代数方法

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曲线和y轴相交的地方，x值是零。因此用0代替x，即可找出y轴截距。
{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/5\/5a\/Find-the-Y-Intercept-Step-2.jpg\/v4-460px-Find-the-Y-Intercept-Step-2.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/5\/5a\/Find-the-Y-Intercept-Step-2.jpg\/v4-728px-Find-the-Y-Intercept-Step-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}

2
解方程，找出截距。 如：
- 问：找出下列方程曲线的y轴截距： x+4y=16
- 曲线和y轴相交的地方，横坐标为0。因此我们代入x=0。
  - (0) + 4y = 16 继续解，得 4y = 16
  - 两边同除以4，得到y=4 。因为在原点上方（否则就要取绝对值），4就是这个曲线的y轴截距。
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方法 2

方法 2 的 2:

通过图像方法

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{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/d\/d6\/Find-the-Y-Intercept-Step-3.jpg\/v4-460px-Find-the-Y-Intercept-Step-3.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/d\/d6\/Find-the-Y-Intercept-Step-3.jpg\/v4-728px-Find-the-Y-Intercept-Step-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}
{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/9\/9d\/Find-the-Y-Intercept-Step-4.jpg\/v4-460px-Find-the-Y-Intercept-Step-4.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/9d\/Find-the-Y-Intercept-Step-4.jpg\/v4-728px-Find-the-Y-Intercept-Step-4.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}
{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/a\/ac\/Find-the-Y-Intercept-Step-5.jpg\/v4-460px-Find-the-Y-Intercept-Step-5.jpg","bigUrl":"https:\/\/www.wikihow.com\/images\/thumb\/a\/ac\/Find-the-Y-Intercept-Step-5.jpg\/v4-728px-Find-the-Y-Intercept-Step-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"<div class=\"mw-parser-output\"><\/div>"}

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小提示

你可以通过分离y变量，以更轻松解出截距来。

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