9th Grade Substitution Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the 9th Grade algebraic expressions worksheet.
Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Algebraic Expressions9th Grade Substitution Worksheet — Level 2 — Practice Set 2 — Answers
Replace the letter with the number, then calculate. Use parentheses for negative values.
1.Find the value of −2x − 8 when x = 4
Answer: −16
- −2 × 4 − 8
- = −8 − 8 = −16
2.Find the value of 9x − 4 when x = −3
Answer: −31
- 9 × (−3) − 4
- = −27 − 4 = −31
3.Find the value of −4x + 8 when x = −6
Answer: 32
- −4 × (−6) + 8
- = 24 + 8 = 32
4.Find the value of −4x − 7 when x = 3
Answer: −19
- −4 × 3 − 7
- = −12 − 7 = −19
5.Find the value of 7x when x = −4
Answer: −28
- 7 × (−4) + 0
- = −28 + 0 = −28
6.Find the value of −2x + 8 when x = 2
Answer: 4
- −2 × 2 + 8
- = −4 + 8 = 4
7.Find the value of −x − 9 when x = −1
Answer: −8
- −1 × (−1) − 9
- = 1 − 9 = −8
8.Find the value of 6x − 2 when x = −6
Answer: −38
- 6 × (−6) − 2
- = −36 − 2 = −38
9.Find the value of −x + 4 when x = 2
Answer: 2
- −1 × 2 + 4
- = −2 + 4 = 2
10.Find the value of 8x − 7 when x = 5
Answer: 33
- 8 × 5 − 7
- = 40 − 7 = 33
11.Find the value of 2x − 3 when x = 4
Answer: 5
- 2 × 4 − 3
- = 8 − 3 = 5
12.Find the value of −5x + 2 when x = 9
Answer: −43
- −5 × 9 + 2
- = −45 + 2 = −43
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.
Great work. Here's what to try next: