How do you substitute 8 for w in 2w + 5?

To substitute 8 for w in 2w + 5, replace w with 8 and then simplify the expression.

When you are asked to substitute a value into an algebraic expression, you simply replace the variable with the given number. In this case, the expression is 2w + 5, and you need to substitute 8 for w.

Start by writing down the expression: 2w + 5. Next, replace the variable w with the number 8. This gives you 2(8) + 5. Now, perform the multiplication: 2 times 8 equals 16. So, the expression now reads 16 + 5. Finally, add 16 and 5 together to get 21.

So, when you substitute 8 for w in the expression 2w + 5, the simplified result is 21. This process is useful in many areas of mathematics, including solving equations and evaluating functions. Remember, the key steps are to replace the variable with the given number, perform any necessary arithmetic operations, and simplify the expression to find your answer.