Worked example
Evaluate 3x + 5 when x = 4.
Answer & why
Answer: 17
3 × 4 + 5 = 12 + 5 = 17.
Grade 6 · Math
Substitute in a linear expression
Replace a variable with a given value and follow operation order.
8 generated examples + worked example
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Question 1
Evaluate 4x + 5 when x = 8.
- 40
- 35
- 37
- 39
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 37
Substitute 8 for x: 4 × 8 + 5 = 37.
Question 2
Evaluate 6x + 1 when x = 4.
- 27
- 26
- 23
- 25
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 25
Substitute 4 for x: 6 × 4 + 1 = 25.
Question 3
Evaluate 2x + 5 when x = 12.
- 31
- 28
- 27
- 29
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 29
Substitute 12 for x: 2 × 12 + 5 = 29.
Question 4
Evaluate 8x + 7 when x = 9.
- 80
- 81
- 79
- 78
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 79
Substitute 9 for x: 8 × 9 + 7 = 79.
Question 5
Evaluate 4x + 5 when x = 3.
- 16
- 21
- 15
- 17
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 17
Substitute 3 for x: 4 × 3 + 5 = 17.
Question 6
Evaluate 9x + 2 when x = 10.
- 95
- 92
- 96
- 91
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 92
Substitute 10 for x: 9 × 10 + 2 = 92.
Question 7
Evaluate 9x + 1 when x = 7.
- 64
- 66
- 68
- 62
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 64
Substitute 7 for x: 9 × 7 + 1 = 64.
Question 8
Evaluate 8x + 6 when x = 2.
- 25
- 22
- 21
- 23
A hint
Substitute the value, multiply, then add.
Answer & why
Answer: 22
Substitute 2 for x: 8 × 2 + 6 = 22.