Lire sur la courbe d'une fonction l'antécédent ou les antécédents d'un nombre donné.

A coordinate plane. The x- and y-axes both scale by one. There is a graphed function, y equals f of x, which is made up of line segments. A line segment connects negative ten, negative six to negative eight, negative four. A line segment connects negative eight, negative four to negative seven, negative six. A line segment connects negative seven, negative six to negative three, negative two. A line segment connects negative three, negative two to negative two, negative four. A line segment connects negative two, negative four to zero, negative two. A line segment connects zero, negative two to one, zero. A line segment connects one, zero to two, two. A line segment connects two, two to four, four. A line segment connects four, four to nine, negative one. A line segment connects nine, negative one to ten, negative one.