1. Mathsercise-C
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Substitution
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2. 1 If a = 3 and b = 5, find the value of…. 2a + b 2x3 + 5 6 + 5 11 2ab
Question 2
2x3 + 5
6 + 5 11
2ab
2x3x5 30
Answer 1
Substitution

3. 2 When n = 8… evaluate the expression 3(2n-2) 3 (2x8 – 2) 3x14 42
Question 3
3 (2x8 – 2)
Answer
3x14 42 2
Substitution

4. 3 T = 3x + 4y Find the value of T when… x = -5 and y = 3
Question 4
Answer
T = 3x-5 + 4x3
T =
T = -3 3
Substitution

5. 4 Evaluate A = 3(2b – 4) when…. b = -2 and when.. A = 3 (2x-2 – 4)
Start
A = 3 x -8
A = -24
b = -5
A = 3 (2x-5 – 4)
Answer
A = 3 (-10 – 4)
A = 3 x -14
A = -42 4
Substitution