Math Functions Coordinate system and quadrants

# Coordinate system

To illustrate functions or to draw graphs in gerneral, it requires a coordinate system.

## Cartesian coordinate system

In math we use the cartesian coordinate system.

For that we need coordinate axes, meaning two perpendicular staight lines. These are our two axes.

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### Remember

The vertical axis is the y-axis or ordinate. The x-axis can also be called as abscissa.

If only the positive values are important, a coordinate system can also look like this:

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### Hint

It is very important that you do not interchange the two axes!

In the coordinate system, you also only draw the arrows in the positive direction.