Mathematics - Pre-Algebra - Evaluating expressions - Substitution Step-by-Step

5 steps: (1) To EVALUATE an expression, replace each variable with its given value. (2) Example: Evaluate 4x - 3 when x = 5. Replace: 4(5) - 3 = 20 - 3 = 17. (3) With two variables: Evaluate 2a + 3b when a=4, b=2. Replace: 2(4) + 3(2) = 8 + 6 = 14. (4) Watch PEMDAS! Evaluate x² + 2x when x=3: (3)² +

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Mathematics - Pre-Algebra - Evaluating expressions - Substitution Step-by-Step
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Mathematics - Pre-Algebra - Evaluating expressions - Substitution Step-by-Step

vivmagarwal
vivmagarwalJan 29, 2026

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5 steps: (1) To EVALUATE an expression, replace each variable with its given value. (2) Example: Evaluate 4x - 3 when x = 5. Replace: 4(5) - 3 = 20 - 3 = 17. (3) With two variables: Evaluate 2a + 3b when a=4, b=2. Replace: 2(4) + 3(2) = 8 + 6 = 14. (4) Watch PEMDAS! Evaluate x² + 2x when x=3: (3)² +

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MathematicsPre-AlgebraClass 6, Stage 6, Class 6, Grade 6, MYP Grade 6

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