It is an algebraic term.
it is a varible
it using the word x and y
The difference is that an algebraic expression has numbers, symbols and variables, but a verbal expression has only words.
The term "numerical" means "involving numbers" and the term "expression" means "phrase". So a numerical expression is a mathematical phrase involving only numbers and one or more operational symbols.
an expression with only numbers in it
The answer will depend on what you mean by symbols. I suggest that it is neither an equation, expression nor formula - just a collection of symbols. If you have some numbers, operators and variables then it may be a formula, but even then, only if the collection is in a proper order. For example, 3*/4+(4/0)-/7.59 is a nonsense collection of symbols and numbers.
Numerical equations have only numbers and symbols, while algebraic equations have variables also.
A numerical expression!
A expression that only contains numbers is a Numerical