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It means you replace each instance of the given variable with the given value.

For instance, you have the following equation:

A(A+2A)= B

Then someone says to "substitute the value '4' for each instance of 'A'.

You'd just replace them, and get:

4 ( 4 + 2(4)) = B

Q: What does it mean to substitute a given value for each variable in an algeraic expression?

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Say you have an algebraic expression y = 3x +4 For a given value of x = 5 substitute that number in place of x in the expression, so in this case y = 3(5) + 4 = 19

that means to replace the variable with it's value, and then do all the mathematical symbols as normal (+-x/)

It is a variable which, in the given expression, can have any value you like.

When a given set of values for the variables are substituted in the expression the result is the value of the expression.

It is called evaluating the equation.

Related questions

Take 3 and substitute into the expression given to you but not mentioned in the question here and evaluate the expression. "Sub and Solve" I say.

Say you have an algebraic expression y = 3x +4 For a given value of x = 5 substitute that number in place of x in the expression, so in this case y = 3(5) + 4 = 19

You have to substitute a value for the letter variable in the expression. This is what we call evaluating the algebraic expression. An example would be 3x+1=7, when x=2.

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.

A variable

To evaluate an expression is nothing but to operate the given expression according to the operators given in the expression if it is evaluable i.e, it could be convertable.

Simplify each expression

that means to replace the variable with it's value, and then do all the mathematical symbols as normal (+-x/)

a table used to show values of the variable expression for a given function

It is a variable which, in the given expression, can have any value you like.

When a given set of values for the variables are substituted in the expression the result is the value of the expression.

4x2-6.5 = 2.5