The whole idea of a variable is that any number can replace it.
The term for replacing a variable with another value or expression is "substitution."
Substitution
evaluation, evaluate.
That means that you replace something, for something else. For example, a variable for a number, or a variable for some other expression.
The whole idea of a variable is that any number can replace it.
No, replacing a negative variable with a negative number does not automatically make the number positive. The sign of the number is determined by the operation being performed. In mathematical operations, the signs of the numbers involved must be taken into consideration to determine the final result. Simply replacing a negative variable with a negative number does not change the inherent negativity of the number.
solution
The term for replacing a variable with another value or expression is "substitution."
When you replace the variable with a number and perform the operations, you evaluate an expression. This process involves substituting the numerical value for the variable and simplifying the expression according to the given operations. Evaluation is a fundamental concept in mathematics and is used to determine the value of the expression under specific conditions.
Substitution
evaluation, evaluate.
That means that you replace something, for something else. For example, a variable for a number, or a variable for some other expression.
Evaluate
A variable must be in place of a number, or representing a range of possible values. Otherwise, it is a constant and so yous imply replace it with the value of that constant.
The number that can replace a variable in an equation to make it a true equation is called the solution or root of the equation. This number satisfies the equation when substituted for the variable. In algebra, finding the solution involves solving for the variable by performing various operations to isolate it on one side of the equation. The solution is the value that balances both sides of the equation, making it true.
It's called the "solution" of the equation.