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.
Substituting.
An algebraic equation or inequality can have a solution, an algebraic expression cannot. If substituting a number in place of a variable results in the equation or inequality being a true statement, then that number is a solution of the equation or inequality.
It is called evaluating the equation.
substitution
No, you can only simplify an expression. To solve for a variable, it must be in an equation.
The term for replacing a variable with another value or expression is "substitution."
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Evaluating the expression.
No, if there is a sqaured variable, the equation is not linear.
Substituting a numerical value for each variable in an expression and then simplifying the resulting expression is known as evaluating the expression. This process involves following the order of operations, which includes performing operations inside parentheses first, then exponents, multiplication and division from left to right, and finally addition and subtraction from left to right. By replacing variables with specific numbers, we can determine the exact value of the expression based on those inputs.
An algebraic expression is an expression or and equation that contains at least 1 variable
I think it is called "replacing" or "substitution".