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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 591 · 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.A father is 16 years older than his son. In 5 years, the father will be three times as old as his son. How old is the son now?
  2. 2.Solve: y/4 + y/6 = 5. What is y?
  3. 3.The length of a rectangle is 11 cm more than its width. Its perimeter is 90 cm. What is its width (in cm)?
  4. 4.Solve: x/3 + x/4 = 28. What is x?
  5. 5.A father is 13 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
  6. 6.Solve: t/6 + t/4 = 25. What is t?
  7. 7.A father is 21 years older than his son. In 5 years, the father will be four times as old as his son. How old is the son now?
  8. 8.The sum of three consecutive whole numbers is 27. What is the largest of them?
  9. 9.Solve: 8p + 2 = 2p + 68. What is p?
  10. 10.Solve: 3(x − 5) = 2x + 2. What is x?
  11. 11.A father is 22 years older than his son. In 2 years, the father will be three times as old as his son. How old is the son now?
  12. 12.Solve: 7n + 11 = n + 41. What is n?
  13. 13.The length of a rectangle is 1 cm more than its width. Its perimeter is 38 cm. What is its width (in cm)?
  14. 14.A father is 7 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
  15. 15.The sum of four consecutive whole numbers is 78. What is the smallest of them?
  16. 16.Solve: t/2 + t/5 = 42. What is t?
  17. 17.The length of a rectangle is 4 cm more than its width. Its perimeter is 92 cm. What is its width (in cm)?
  18. 18.The length of a rectangle is 1 cm more than its width. Its perimeter is 86 cm. What is its width (in cm)?
  19. 19.Solve: 3(p − 5) = p + 21. What is p?
  20. 20.Solve: 5(m − 3) = m + 21. What is m?
  21. 21.Solve: 3(x − 4) = 2x + 10. What is x?
  22. 22.Solve: x/2 + x/3 = 25. What is x?
  23. 23.A father is 20 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
  24. 24.Solve: 7y + 5 = 2y + 10. What is y?
  25. 25.Solve: p/3 + p/4 = 7. What is p?
  26. 26.Solve: 9y + 1 = 7y + 9. What is y?
  27. 27.The sum of three consecutive whole numbers is 126. What is the largest of them?
  28. 28.The length of a rectangle is 11 cm more than its width. Its perimeter is 106 cm. What is its width (in cm)?
  29. 29.Solve: 8n + 8 = 7n + 20. What is n?
  30. 30.The sum of three consecutive whole numbers is 24. What is the largest of them?
  31. 31.Solve: m/4 + m/2 = 15. What is m?
  32. 32.The length of a rectangle is 15 cm more than its width. Its perimeter is 54 cm. What is its width (in cm)?
  33. 33.A father is 20 years older than his son. In 2 years, the father will be three times as old as his son. How old is the son now?
  34. 34.A father is 4 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
  35. 35.A father is 12 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
  36. 36.Solve: 5(x − 2) = 4x + 4. What is x?
  37. 37.Solve: 8m + 1 = 7m + 2. What is m?
  38. 38.Solve: 3(x − 3) = 2x + 9. What is x?
  39. 39.A father is 22 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?
  40. 40.Solve: 8x + 18 = 7x + 33. What is x?

Answer key

  1. 3
  2. 12
  3. 17
  4. 48
  5. 11
  6. 60
  7. 2
  8. 10
  9. 11
  10. 17
  11. 9
  12. 5
  13. 9
  14. 4
  15. 18
  16. 60
  17. 21
  18. 21
  19. 18
  20. 9
  21. 22
  22. 30
  23. 12
  24. 1
  25. 12
  26. 4
  27. 43
  28. 21
  29. 12
  30. 9
  31. 20
  32. 6
  33. 8
  34. 3
  35. 6
  36. 14
  37. 1
  38. 18
  39. 7
  40. 15

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