Substituting Values into Expressions
Instructions: Evaluate each expression by substituting the given values for the variables. Show your working.
Section A: Single Variable
1. If x = 5, find the value of: 3x + 7
Answer: _______________________________
2. If a = 8, find the value of: 2a − 10
Answer: _______________________________
3. If n = 4, find the value of: n² + 6
Answer: _______________________________
4. If y = 12, find the value of: y/3 + 9
Answer: _______________________________
Section B: Two Variables
5. If x = 6 and y = 3, find the value of: x + y
Answer: _______________________________
6. If a = 10 and b = 2, find the value of: 4a − 3b
Answer: _______________________________
7. If m = 5 and n = 7, find the value of: 2m + n
Answer: _______________________________
8. If p = 9 and q = 4, find the value of: p² − q²
Answer: _______________________________
Section C: Challenge Questions
9. If x = 3, find the value of: 5x² − 2x + 8
Answer: _______________________________
10. If a = 6 and b = 2, find the value of: 3(a + b) − 4
Answer: _______________________________
11. If x = 8 and y = 5, find the value of: xy + x − y
Answer: _______________________________
12. If m = 10, find the value of: m/2 + m/5
Answer: _______________________________