# Algebra

Triangle

Algebra is the way we connect our ideas about geometry with our ideas about numbers. You can use equations to represent geometric shapes. You can also use equations to represent the movement of numbers (or real objects like trains) through time or space.

The simplest equations have only one variable. They look like y = 3 or x = 4+15. These equations define a line in space: they tell you which line someone is talking about.

Equations can also have two variables. These look like y = 2x + 1 or x = 4y - 12. These equations also define a straight line, but the line can be tilted in various ways, and can move up or down, to the left or to the right.

Quadratic equations help you to define a curved line. They look like y = x^{2} or x = 8y^{3} + 16.

To find out more about algebra, check out these books from Amazon.com or from your library:

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