Any complex number can be written in fallowing form: Z = x + yi
When drawing complex numbers as point on x,y coordinate system we can use variables x and y to represent our coordinates in x y coordinate system.
Our complex number is: Z = 3i which means x = 0 and y = 3 x is real part of complex number and we draw it on x axis (real number axis) and y is imaginery part and we draw it on y axis (imaginery axis)
