Algebra is a branch of mathematics dealing with symbols and the rules for manipulating those symbols. in dementary algebra, those symbols (today written as latin and greek letters) represent quantities without fixed values, known as variables. just as sentences describe relationships between specific words, in algebra, equations describe relationships between variables. take the following example.
i have two fields that total 1,800 square yards. yields for each field are 1/2 gallon of grain per square yard and 1/2 the first field gave 500 more gallon that the second.