Hàm số $y = \left| {x + 1} \right| + \left| {x - 3} \right|$ được viết lại là

$y = \left\{ \begin{array}{l} - 2x + 2\,\,\,\,khi\,\,\,\,x \le - 1\\4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\,\, - 1 3\end{array} \right.$.

$y = \left\{ \begin{array}{l}2x - 2\,\,\,\,\,\,\,khi\,\,\,\,x \le - 1\\4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\, - 1 3\end{array} \right.$.

$y = \left\{ \begin{array}{l}2x + 2\,\,\,\,\,\,\,\,khi\,\,\,\,x \le - 1\\4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\, - 1 3\end{array} \right.$.

$y = \left\{ \begin{array}{l} - 2x + 2\,\,\,\,khi\,\,\,x \le - 1\\4\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,khi\,\,\,\, - 1 3\end{array} \right.$.

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