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A symbol usually a letter used to represent a number in mathematical expressions or sentences?
X and y
What is the definition of equivalent numerical expressions?
That means that the two expressions represent the same number.
What is the letter that represent the composite number?
The letter that represent the composite number is letter C.
What is algebraic strategy for solving a system of equations when two expressions are the same?
An expression is the algebraic representation of a number - an expression has a numeric value.An equation is an algebraic statement claiming that two expressions have the same numeric value. The equation has a Boolean value (true or false).If two equations can be expressed in an identical manner (the same expression on both sides) - then these equations are the same equation.In order for a system of equations to have a solution, the number of different equations in the system must be equal to the number of variables in the system. If there are more distinct equations than there are variables, than the system has no solution. If there are less, then the system may have no solution, or infinitely many solutions.In the case described there is most likely an infinite number of solutions
Why do you use letters in algebraic expressions?
the reason you use letters in algebraic expressions is because you don't know the number so a letter replaces it.
