There are 4 ways to describe a general line (not passing through the origine, neigher vertical nor horizontal) in the cartesian plane: by an implicite equation, an equation giving $y$ as a function of $x$, one giving $x$ as a function of $y$, or a system of parametric equations.

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- Description: exercise : recognize a line by equation or by graph. exercises interactifs, calcul et tracé de graphes en ligne
- Keywords: interactive mathematics, interactive math, server side interactivity, geometry, algebra, lines, parametric_curves