Problems from Cartesian axes and representation of points in the plane

Development:

Theoretical exercise.

Solution:

To place a point $P=(a,b)$ in the plane, the procedure to follow is the following one:

1. We draw a coordinates axes.
2. We place point $a$ in the horizontal axis and point $b$ in the vertical axis.
3. We draw straight lines perpendicular to the axes for $a$ and for $b$.
4. The intersection of the previous perpendicular lines is point $P$.

The horizontal axis is called the abscissa axis. The vertical axis is called the ordinates axis.

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