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At the end of the period, you should be able to: 1. Evaluate Expression 2. Apply the order of operation in evaluating algebraic expressions Evaluating Expression 1 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. 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. 6 + 45 – 20 51 – 20 =31 Evaluating Example Substitute in the numbers. Remember correct order of operations. For the expression 5x + 9y: • Evaluate if x = 3 and y = -2. For the expression 5x + 9y: • Find x if y = 10 and the expression equals 120. For the expression 5x + 9y: • Find y if x = -7 and the expression equals 1