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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 211 · 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: 9x + 18 = 2x + 53. What is x?
  2. 2.Solve: 6(y − 4) = 3y + 33. What is y?
  3. 3.Solve: 6(p − 5) = p + 45. What is p?
  4. 4.Solve: y/4 + y/6 = 5. What is y?
  5. 5.Solve: n/5 + n/4 = 27. What is n?
  6. 6.Solve: 6(y − 4) = 4y + 6. What is y?
  7. 7.Solve: 3y + 9 = y + 39. What is y?
  8. 8.Solve: 6(m − 4) = 3m + 18. What is m?
  9. 9.Solve: 5p + 1 = 3p + 7. What is p?
  10. 10.A father is 26 years older than his son. In 8 years, the father will be three times as old as his son. How old is the son now?
  11. 11.Solve: 5(n − 4) = 4n + 4. What is n?
  12. 12.Solve: 7y + 15 = 2y + 80. What is y?
  13. 13.Solve: 6n + 14 = n + 29. What is n?
  14. 14.The length of a rectangle is 11 cm more than its width. Its perimeter is 54 cm. What is its width (in cm)?
  15. 15.A father is 24 years older than his son. In 3 years, the father will be three times as old as his son. How old is the son now?
  16. 16.Solve: 5p + 10 = 4p + 15. What is p?
  17. 17.The length of a rectangle is 15 cm more than its width. Its perimeter is 86 cm. What is its width (in cm)?
  18. 18.Solve: t/5 + t/4 = 9. What is t?
  19. 19.Solve: 4(t − 1) = 3t + 10. What is t?
  20. 20.Solve: t/3 + t/5 = 48. What is t?
  21. 21.Solve: 4(x − 4) = x + 5. What is x?
  22. 22.A father is 16 years older than his son. In 7 years, the father will be twice as old as his son. How old is the son now?
  23. 23.Solve: 6(x − 3) = 2x + 26. What is x?
  24. 24.Solve: x/2 + x/6 = 24. What is x?
  25. 25.A father is 9 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?
  26. 26.The length of a rectangle is 2 cm more than its width. Its perimeter is 108 cm. What is its width (in cm)?
  27. 27.A father is 30 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?
  28. 28.A father is 16 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
  29. 29.The length of a rectangle is 13 cm more than its width. Its perimeter is 46 cm. What is its width (in cm)?
  30. 30.A father is 8 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
  31. 31.Solve: x/2 + x/6 = 12. What is x?
  32. 32.The sum of two consecutive whole numbers is 21. What is the smallest of them?
  33. 33.Solve: 4y + 17 = 2y + 35. What is y?
  34. 34.Solve: p/4 + p/5 = 45. What is p?
  35. 35.Solve: 3y + 3 = y + 11. What is y?
  36. 36.Solve: 5x + 8 = 4x + 23. What is x?
  37. 37.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?
  38. 38.The length of a rectangle is 10 cm more than its width. Its perimeter is 40 cm. What is its width (in cm)?
  39. 39.The sum of three consecutive whole numbers is 117. What is the smallest of them?
  40. 40.Solve: 6(n − 4) = 3n + 18. What is n?

Answer key

  1. 5
  2. 19
  3. 15
  4. 12
  5. 60
  6. 15
  7. 15
  8. 14
  9. 3
  10. 5
  11. 24
  12. 13
  13. 3
  14. 8
  15. 9
  16. 5
  17. 14
  18. 20
  19. 14
  20. 90
  21. 7
  22. 9
  23. 11
  24. 36
  25. 2
  26. 26
  27. 2
  28. 10
  29. 5
  30. 7
  31. 18
  32. 10
  33. 9
  34. 100
  35. 4
  36. 15
  37. 2
  38. 5
  39. 38
  40. 14

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