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8th Grade Substitution Worksheet — Level 2 — Practice Set 4 — Answers

Answer sheet with worked solutions for the 8th Grade algebraic expressions worksheet.

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Success TutoringWorksheetsAnswer sheet8th Grade · Mathematics · Algebraic Expressions

8th Grade Substitution Worksheet — Level 2 — Practice Set 4 — Answers

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

1.Find the value of −4x − 7 when x = −6

Answer: 17

  1. −4 × (−6) − 7
  2. = 24 − 7 = 17
2.Find the value of −x + 9 when x = −3

Answer: 12

  1. −1 × (−3) + 9
  2. = 3 + 9 = 12
3.Find the value of 2x + 8 when x = 4

Answer: 16

  1. 2 × 4 + 8
  2. = 8 + 8 = 16
4.Find the value of −x + 2 when x = 4

Answer: −2

  1. −1 × 4 + 2
  2. = −4 + 2 = −2
5.Find the value of 2x − 8 when x = 5

Answer: 2

  1. 2 × 5 − 8
  2. = 10 − 8 = 2
6.Find the value of x + 8 when x = 1

Answer: 9

  1. 1 × 1 + 8
  2. = 1 + 8 = 9
7.Find the value of 3x − 4 when x = −6

Answer: −22

  1. 3 × (−6) − 4
  2. = −18 − 4 = −22
8.Find the value of −2x − 5 when x = 2

Answer: −9

  1. −2 × 2 − 5
  2. = −4 − 5 = −9
9.Find the value of 2x + 2 when x = 5

Answer: 12

  1. 2 × 5 + 2
  2. = 10 + 2 = 12
10.Find the value of −x + 5 when x = 5

Answer: 0

  1. −1 × 5 + 5
  2. = −5 + 5 = 0
11.Find the value of 5x when x = 4

Answer: 20

  1. 5 × 4 + 0
  2. = 20 + 0 = 20
12.Find the value of −x − 8 when x = 7

Answer: −15

  1. −1 × 7 − 8
  2. = −7 − 8 = −15
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