Definition: A branch of mathematics that substitutes letters for
numbers. An algebraic equation represents a scale, what is done on one
side of the scale with a number is also done to the other side of the
scale. The numbers are the constants. Algebra can include real numbers,
complex numbers, matrices, vectors etc. Moving from Arithmetic to
Algebra will look something like this: Arithmetic: 3 + 4 = 3 + 4 in
Algebra it would look like: x + y = y + x
