1. Simplifying Expressions

2. Objective
simplify and evaluate algebraic expressions

3. Evaluating Expressions
Evaluate the expression 2x – 3xy +4y when
x = 3 and y = -5.
To find the numerical value of the expression, simply replace the variables in the expression with the appropriate number.
Remember to use correct order of operations.

4. Example Evaluate 2x–3xy +4y when x = 3 and y = -5.
Substitute in the numbers.
2(3) – 3(3)(-5) + 4(-5)
Use correct order of operations.
– 20
51 – 20 31

5. Evaluating Example

6. Evaluating Example
Substitute in the numbers.

7. Evaluating Example
Substitute in the numbers.

8. Evaluating Example Substitute in the numbers.
Remember correct order of operations.

9. Common Mistakes
Incorrect
Correct

10. More Examples