Functions and graphs

# Cartesian coordinate system

A **Cartesian coordinate system** specifies each point uniquely on a plane by a pair of numerical coordinates, which are the distances from the point to two fixed perpendicular lines. Each reference line is called a coordinate axis of the system, and the point where they meet is its origin, (0,0).

The horizontal or x-axis is called **abscissa axis**, and the vertical or y- axis is called **ordinate axis**.

Examples:

**Exercise**: represent G(1,-5); H(0,-2); I(-3,3); J(-2,0); K(1,1); L(-1,-5)

Solutions:

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