Examples of algebraic expressions

x y a (letters)

7u 1/2q (or q/2) 3.9p (product of a variable and number)

s + 5 u+v 2.3+r (Sum of a variable and number)

z - 3.5 k-n t-1.3 (difference of a variable and number)

m/6 (z/2) 3.9/p (quotient of a variable and number)

C² b0.5 √3 (variable or number with an exponent)

Finally, the sum, difference, product or quotient of these items are also expressions.

Equations are defined as algebraic expressions that are set equal to a number, variable or another expression. The simplest identifier of an equation is the equal sign (=). When an equation is written to express a condition or represent a situation for problem solving, the solution is normally completed by manipulating the equation correctly so that a variable or unknown quantity is on one side of the equal sign and the numerical answer(s) are on the other side of the equal sign.