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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 773 · 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.The length of a rectangle is 2 cm more than its width. Its perimeter is 72 cm. What is its width (in cm)?
  2. 2.A father is 28 years older than his son. In 7 years, the father will be three times as old as his son. How old is the son now?
  3. 3.Solve: 9x + 2 = x + 74. What is x?
  4. 4.Solve: t/3 + t/2 = 40. What is t?
  5. 5.Solve: m/5 + m/2 = 56. What is m?
  6. 6.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?
  7. 7.Solve: 4y + 3 = 3y + 15. What is y?
  8. 8.The sum of four consecutive whole numbers is 126. What is the smallest of them?
  9. 9.The length of a rectangle is 3 cm more than its width. Its perimeter is 38 cm. What is its width (in cm)?
  10. 10.Solve: 5(y − 1) = y + 7. What is y?
  11. 11.A father is 12 years older than his son. In 1 year, the father will be four times as old as his son. How old is the son now?
  12. 12.The sum of three consecutive whole numbers is 27. What is the smallest of them?
  13. 13.Solve: m/6 + m/3 = 9. What is m?
  14. 14.Solve: 3n + 5 = 2n + 15. What is n?
  15. 15.The sum of two consecutive whole numbers is 37. What is the smallest of them?
  16. 16.Solve: y/6 + y/5 = 11. What is y?
  17. 17.Solve: m/4 + m/2 = 15. What is m?
  18. 18.Solve: 4(t − 3) = 3t + 7. What is t?
  19. 19.Solve: 6(n − 1) = 4n + 10. What is n?
  20. 20.The length of a rectangle is 15 cm more than its width. Its perimeter is 150 cm. What is its width (in cm)?
  21. 21.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?
  22. 22.A father is 21 years older than his son. In 1 year, the father will be four times as old as his son. How old is the son now?
  23. 23.The length of a rectangle is 9 cm more than its width. Its perimeter is 70 cm. What is its width (in cm)?
  24. 24.Solve: x/3 + x/5 = 24. What is x?
  25. 25.Solve: n/2 + n/3 = 5. What is n?
  26. 26.Solve: 4(n − 5) = n + 37. What is n?
  27. 27.Solve: 4(t − 5) = 2t + 12. What is t?
  28. 28.Solve: 8n + 5 = 5n + 44. What is n?
  29. 29.Solve: 4(p − 1) = p + 14. What is p?
  30. 30.Solve: 3(t − 1) = 2t + 9. What is t?
  31. 31.Solve: 3p + 1 = 2p + 10. What is p?
  32. 32.The length of a rectangle is 11 cm more than its width. Its perimeter is 42 cm. What is its width (in cm)?
  33. 33.Solve: y/4 + y/5 = 54. What is y?
  34. 34.Solve: x/6 + x/3 = 12. What is x?
  35. 35.The length of a rectangle is 4 cm more than its width. Its perimeter is 24 cm. What is its width (in cm)?
  36. 36.Solve: 3y + 3 = 2y + 4. What is y?
  37. 37.Solve: 6m + 15 = 5m + 25. What is m?
  38. 38.Solve: 4t + 4 = t + 19. What is t?
  39. 39.A father is 27 years older than his son. In 7 years, the father will be four times as old as his son. How old is the son now?
  40. 40.The length of a rectangle is 15 cm more than its width. Its perimeter is 130 cm. What is its width (in cm)?

Answer key

  1. 17
  2. 7
  3. 9
  4. 48
  5. 80
  6. 2
  7. 12
  8. 30
  9. 8
  10. 3
  11. 3
  12. 8
  13. 18
  14. 10
  15. 18
  16. 30
  17. 20
  18. 19
  19. 8
  20. 30
  21. 8
  22. 6
  23. 13
  24. 45
  25. 6
  26. 19
  27. 16
  28. 13
  29. 6
  30. 12
  31. 9
  32. 5
  33. 120
  34. 24
  35. 4
  36. 1
  37. 10
  38. 5
  39. 2
  40. 25

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