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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 710 · 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: 3t + 9 = t + 11. What is t?
  2. 2.Solve: t/5 + t/2 = 28. What is t?
  3. 3.A father is 24 years older than his son. In 3 years, the father will be four times as old as his son. How old is the son now?
  4. 4.Solve: y/2 + y/5 = 35. What is y?
  5. 5.Solve: 5(p − 1) = 2p + 25. What is p?
  6. 6.Solve: 6(y − 2) = 3y + 6. What is y?
  7. 7.Solve: 5y + 15 = 4y + 17. What is y?
  8. 8.Solve: 5(m − 5) = 2m + 26. What is m?
  9. 9.Solve: 4(y − 1) = 3y + 6. What is y?
  10. 10.Solve: 7n + 4 = 4n + 31. What is n?
  11. 11.The sum of two consecutive whole numbers is 15. What is the largest of them?
  12. 12.Solve: 6(y − 3) = y + 17. What is y?
  13. 13.The length of a rectangle is 8 cm more than its width. Its perimeter is 92 cm. What is its width (in cm)?
  14. 14.Solve: 6m + 4 = 4m + 22. What is m?
  15. 15.The sum of two consecutive whole numbers is 75. What is the largest of them?
  16. 16.Solve: 8n + 2 = n + 72. What is n?
  17. 17.The length of a rectangle is 1 cm more than its width. Its perimeter is 30 cm. What is its width (in cm)?
  18. 18.Solve: p/6 + p/5 = 77. What is p?
  19. 19.The length of a rectangle is 12 cm more than its width. Its perimeter is 100 cm. What is its width (in cm)?
  20. 20.Solve: m/5 + m/4 = 27. What is m?
  21. 21.A father is 12 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?
  22. 22.Solve: 8n + 1 = n + 57. What is n?
  23. 23.Solve: 8p + 7 = 2p + 79. What is p?
  24. 24.Solve: x/6 + x/3 = 15. What is x?
  25. 25.Solve: 9y + 6 = 4y + 56. What is y?
  26. 26.Solve: 6(t − 5) = 5t + 1. What is t?
  27. 27.The sum of three consecutive whole numbers is 48. What is the smallest of them?
  28. 28.Solve: t/4 + t/2 = 21. What is t?
  29. 29.Solve: n/4 + n/2 = 18. What is n?
  30. 30.Solve: 7x + 7 = 5x + 13. What is x?
  31. 31.Solve: 7m + 1 = 4m + 4. What is m?
  32. 32.Solve: m/6 + m/4 = 20. What is m?
  33. 33.Solve: 7y + 1 = 2y + 41. What is y?
  34. 34.A father is 20 years older than his son. In 6 years, the father will be three times as old as his son. How old is the son now?
  35. 35.Solve: 6t + 14 = 3t + 38. What is t?
  36. 36.The length of a rectangle is 3 cm more than its width. Its perimeter is 82 cm. What is its width (in cm)?
  37. 37.The sum of three consecutive whole numbers is 108. What is the largest of them?
  38. 38.Solve: n/4 + n/5 = 36. What is n?
  39. 39.A father is 45 years older than his son. In 8 years, the father will be four times as old as his son. How old is the son now?
  40. 40.Solve: x/4 + x/3 = 14. What is x?

Answer key

  1. 1
  2. 40
  3. 5
  4. 50
  5. 10
  6. 6
  7. 2
  8. 17
  9. 10
  10. 9
  11. 8
  12. 7
  13. 19
  14. 9
  15. 38
  16. 10
  17. 7
  18. 210
  19. 19
  20. 60
  21. 2
  22. 8
  23. 12
  24. 30
  25. 10
  26. 31
  27. 15
  28. 28
  29. 24
  30. 3
  31. 1
  32. 48
  33. 8
  34. 4
  35. 8
  36. 19
  37. 37
  38. 80
  39. 7
  40. 24

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