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This document provides examples of how to evaluate algebraic expressions and formulas by substituting given values for variables and simplifying. It demonstrates substituting 1 for X in the expression X + 4 to get an answer of 5, substituting 4 for X and 2 for Y in 5XY to get an answer of 40, and substituting 10 for X in the formula Y = X + 2 to solve for Y being equal to 12.
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Review in Action
- 2. Remember, To evaluate algebraic expressions and formulas, Substitute the given value for the variable(s) and simplify. Here are some examples:
- 3. Evaluate the expression X + 4 for X = 1 Solution: Substitute 1 for X 1 + 4 = 5 So, the answer is 5
- 4. Evaluate the expression 5XY for X = 4 and Y = 2 Solution: Substitute 4 for X and 2 for Y 5 • 4 • 2 = 40 So, the answer is 40
- 5. Find the value of Y for X = 10 in the formula Y = X + 2 Solution: Substitute 10 for X Y = 10 + 2 So, Y = 12