Success TutoringWorksheets

9th Grade Substitution Worksheet — Level 3 — Practice Set 4 — Answers

Answer sheet with worked solutions for the 9th Grade algebraic expressions worksheet.

Download answers PDFPrint answersBack to worksheet
Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Algebraic Expressions

9th Grade Substitution Worksheet — Level 3 — Practice Set 4 — Answers

Replace the letter with the number, then calculate. Use parentheses for negative values.

1.If x = −3 and y = 4, find the value of −4x2 + 5y

Answer: −16

  1. −4 × (−3)² + 5 × (4)
  2. = −36 + 20 = −16
2.Find the value of −5x + 2 when x = −5

Answer: 27

  1. −5 × (−5) + 2
  2. = 25 + 2 = 27
3.Find the value of 7x + 5 when x = 6

Answer: 47

  1. 7 × 6 + 5
  2. = 42 + 5 = 47
4.If x = −1 and y = −5, find the value of 2x2 + 7y

Answer: −33

  1. 2 × (−1)² + 7 × (−5)
  2. = 2 − 35 = −33
5.If x = 1 and y = 4, find the value of 5x2 + 2y

Answer: 13

  1. 5 × (1)² + 2 × (4)
  2. = 5 + 8 = 13
6.Find the value of −2x + 3 when x = 8

Answer: −13

  1. −2 × 8 + 3
  2. = −16 + 3 = −13
7.If x = −2 and y = 4, find the value of 7x2 + 8y

Answer: 60

  1. 7 × (−2)² + 8 × (4)
  2. = 28 + 32 = 60
8.Find the value of 9x + 7 when x = 2

Answer: 25

  1. 9 × 2 + 7
  2. = 18 + 7 = 25
9.Find the value of 3x + 6 when x = 8

Answer: 30

  1. 3 × 8 + 6
  2. = 24 + 6 = 30
10.Find the value of 8x − 8 when x = 3

Answer: 16

  1. 8 × 3 − 8
  2. = 24 − 8 = 16
11.If x = 5 and y = −3, find the value of −2x2 − y

Answer: −47

  1. −2 × (5)² − 1 × (−3)
  2. = −50 + 3 = −47
12.If x = −1 and y = −5, find the value of 9x2 − 6y

Answer: 39

  1. 9 × (−1)² − 6 × (−5)
  2. = 9 + 30 = 39
Free worksheets at worksheets.successtutoring.com · © Success Tutoring · Free for personal and classroom use

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: