From Förberedande kurs i matematik 2

In the complex number plane, the number \displaystyle z=2+i corresponds to a point in the plane with coordinate 2 along the real axis (x-axis) and coordinate 1 along the imaginary axis (y-axis). In a corresponding way, \displaystyle w=2+3i has the coordinate 2 along the real axis and 3 along the imaginary axis.