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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 385 · 40 sums
TalentJR

The method (Letters one side, numbers the other): Open brackets: a(x − b) = ax − ab. Fractions: multiply both sides by the LCM of the denominators — x/3 + x/4 = 14 → 4x + 3x = 168. Move letter terms to one side and numbers to the other (change the sign when a term crosses =), then divide. Word problems: consecutive numbers are n, n + 1, n + 2 …; ages in y years are age + y.

NameDateTime takenScore ___ / 40
  1. 1.Solve: 8y + 4 = 4y + 40. What is y?
  2. 2.Solve: 6(m − 2) = 2m + 20. What is m?
  3. 3.The length of a rectangle is 4 cm more than its width. Its perimeter is 52 cm. What is its width (in cm)?
  4. 4.Solve: 3(x − 3) = 2x + 10. What is x?
  5. 5.Solve: n/3 + n/6 = 21. What is n?
  6. 6.A father is 30 years older than his son. In 2 years, the father will be four times as old as his son. How old is the son now?
  7. 7.Solve: 3x + 9 = 2x + 16. What is x?
  8. 8.Solve: 5y + 6 = 2y + 24. What is y?
  9. 9.The length of a rectangle is 2 cm more than its width. Its perimeter is 36 cm. What is its width (in cm)?
  10. 10.A father is 30 years older than his son. In 4 years, the father will be three times as old as his son. How old is the son now?
  11. 11.The length of a rectangle is 15 cm more than its width. Its perimeter is 130 cm. What is its width (in cm)?
  12. 12.Solve: y/3 + y/2 = 30. What is y?
  13. 13.Solve: 8m + 5 = 2m + 35. What is m?
  14. 14.Solve: 6y + 5 = 5y + 12. What is y?
  15. 15.The sum of three consecutive whole numbers is 27. What is the smallest of them?
  16. 16.The sum of three consecutive whole numbers is 69. What is the smallest of them?
  17. 17.Solve: x/4 + x/3 = 49. What is x?
  18. 18.Solve: 6(m − 3) = 5m + 3. What is m?
  19. 19.A father is 9 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
  20. 20.The sum of three consecutive whole numbers is 177. What is the smallest of them?
  21. 21.Solve: 4m + 11 = m + 44. What is m?
  22. 22.Solve: 7t + 20 = 4t + 59. What is t?
  23. 23.Solve: 4t + 5 = 3t + 11. What is t?
  24. 24.Solve: 6t + 16 = 3t + 37. What is t?
  25. 25.Solve: n/2 + n/5 = 14. What is n?
  26. 26.Solve: 9y + 18 = 6y + 24. What is y?
  27. 27.Solve: 3(x − 1) = 2x + 6. What is x?
  28. 28.The length of a rectangle is 5 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
  29. 29.A father is 7 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  30. 30.Solve: 3(t − 1) = t + 19. What is t?
  31. 31.Solve: 5(y − 2) = y + 10. What is y?
  32. 32.The sum of three consecutive whole numbers is 153. What is the largest of them?
  33. 33.Solve: 4(n − 4) = 2n + 14. What is n?
  34. 34.The length of a rectangle is 13 cm more than its width. Its perimeter is 66 cm. What is its width (in cm)?
  35. 35.The sum of three consecutive whole numbers is 36. What is the largest of them?
  36. 36.Solve: 3p + 20 = p + 22. What is p?
  37. 37.The length of a rectangle is 14 cm more than its width. Its perimeter is 64 cm. What is its width (in cm)?
  38. 38.The length of a rectangle is 2 cm more than its width. Its perimeter is 72 cm. What is its width (in cm)?
  39. 39.Solve: 7m + 7 = 2m + 27. What is m?
  40. 40.Solve: 7y + 2 = 2y + 12. What is y?

Answer key

  1. 9
  2. 8
  3. 11
  4. 19
  5. 42
  6. 8
  7. 7
  8. 6
  9. 8
  10. 11
  11. 25
  12. 36
  13. 5
  14. 7
  15. 8
  16. 22
  17. 84
  18. 21
  19. 8
  20. 58
  21. 11
  22. 13
  23. 6
  24. 7
  25. 20
  26. 2
  27. 9
  28. 12
  29. 5
  30. 11
  31. 5
  32. 52
  33. 15
  34. 10
  35. 13
  36. 1
  37. 9
  38. 17
  39. 4
  40. 2

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