What is the definition of Algebraic Equation.

It is a form of polynomial ... with a finite number of variables, some of which are expressed as letters, that equate to 0

Algebra is solving for the unknown and an equation has an equals sign (or or < etc) so

basically it is an equaiton with at least one unknown number (normally represented by x y or z) which is related to another bunch of numbers so

x+3=5 is an algbraic equation