Evaluate
That looks like the description of an EXPRESSION. However, an expression need not have "at least one operation"; a single number, or variable, is a perfectly valid expression.
You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.You have to assign some variable to "some number", for example "x". Then your expression becomes 12 / x.
An algebraic expression can have a mixture of numbers and variables, but it does not contain an equals sign.
2f
17 - y
That is called 'solving'.
322
The term for replacing a variable with another value or expression is "substitution."
Evaluating the expression.
Substituting.
Variable is any letter used in an algebraic expression, and can vary (change form) to be any number, and one variable means the same number in any single algebraic expression. Usually algebra is simplifying the expression or equation until you know what the variable is equal to.
That is sometimes known as EVALUATING the expression.
And the question is ...
It is called evaluating the equation.
The answer to the question is given in the question!If you want to find the value of an algebraic expression, then you need to substitute numerical values for each of the variables in the expression, and then calculate and simplify the result.
Because you are substituting a number for a variable. Like substituting salt for sugar in a cake recipe. Although you really shouldn't do the latter.
A variable is a letter that represents a number. An expression that contains at least one variable is called variable expression, also called algebraic expression. A variable expression has one or more terms. A term is a number, a variable, or a product of numbers and variables. For example,3(x^2)y + 2xy + x - 7 is a variable expression, where you have 4 terms.When working with variable expression, you often use the substitution principle:If a = b, then a may be replaced by b in any expression.The set of numbers that a variable may be represent is called replacement set, or domain, of the variable. To evaluate a variable expression, you replace each variable with one of its values and simplify the numerical expression that results.Example: Evaluate the expression 2x - 4y for x = 5 and y = -9.Solution:2x - 4y= 2(5) - 4(-9)= 10 + 36=46