In mathematics, a complex number is a number that can be expressed in the form a + bi, where a and b are real numbers and i is the imaginary unit, which is defined by i^2 = -1. Complex numbers can be represented graphically as points on a plane, called the complex plane. The real numbers are represented by the points on the horizontal axis, and the imaginary numbers are represented by the points on the vertical axis.
To find the real and complex parts of a complex number from a graph, first identify the point on the complex plane that corresponds to the complex number. The real part of the complex number is the x-coordinate of the point, and the imaginary part is the y-coordinate of the point.
