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Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 576 · 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 11 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
  2. 2.Solve: 5(y − 3) = 3y + 9. What is y?
  3. 3.Solve: 6(n − 1) = n + 39. What is n?
  4. 4.Solve: y/6 + y/2 = 16. What is y?
  5. 5.The sum of three consecutive whole numbers is 162. What is the smallest of them?
  6. 6.Solve: 6(m − 2) = 2m + 8. What is m?
  7. 7.A father is 34 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?
  8. 8.Solve: 8y + 18 = 7y + 21. What is y?
  9. 9.Solve: 4t + 11 = 2t + 39. What is t?
  10. 10.The sum of four consecutive whole numbers is 114. What is the largest of them?
  11. 11.A father is 9 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
  12. 12.Solve: 4y + 2 = 2y + 12. What is y?
  13. 13.A father is 32 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?
  14. 14.The sum of two consecutive whole numbers is 75. What is the smallest of them?
  15. 15.Solve: 5(p − 5) = 4p + 8. What is p?
  16. 16.A father is 30 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?
  17. 17.Solve: 4(m − 3) = m + 24. What is m?
  18. 18.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?
  19. 19.A father is 30 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?
  20. 20.The length of a rectangle is 5 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
  21. 21.The length of a rectangle is 1 cm more than its width. Its perimeter is 30 cm. What is its width (in cm)?
  22. 22.Solve: 4(x − 2) = x + 1. What is x?
  23. 23.Solve: 6x + 5 = 3x + 11. What is x?
  24. 24.The sum of three consecutive whole numbers is 183. What is the smallest of them?
  25. 25.The length of a rectangle is 3 cm more than its width. Its perimeter is 94 cm. What is its width (in cm)?
  26. 26.The sum of two consecutive whole numbers is 91. What is the smallest of them?
  27. 27.Solve: 3(y − 2) = y + 4. What is y?
  28. 28.Solve: 3n + 3 = n + 7. What is n?
  29. 29.Solve: 5y + 9 = 2y + 27. What is y?
  30. 30.Solve: 5y + 14 = y + 42. What is y?
  31. 31.The length of a rectangle is 1 cm more than its width. Its perimeter is 90 cm. What is its width (in cm)?
  32. 32.The length of a rectangle is 10 cm more than its width. Its perimeter is 48 cm. What is its width (in cm)?
  33. 33.Solve: 4(t − 5) = 2t + 26. What is t?
  34. 34.Solve: 3t + 19 = 2t + 33. What is t?
  35. 35.Solve: 3t + 1 = 2t + 14. What is t?
  36. 36.Solve: y/3 + y/2 = 30. What is y?
  37. 37.Solve: 9p + 9 = 3p + 39. What is p?
  38. 38.Solve: 4(m − 1) = m + 26. What is m?
  39. 39.Solve: 7n + 4 = 3n + 28. What is n?
  40. 40.Solve: m/2 + m/6 = 4. What is m?

Answer key

  1. 5
  2. 12
  3. 9
  4. 24
  5. 53
  6. 5
  7. 9
  8. 3
  9. 14
  10. 30
  11. 6
  12. 5
  13. 11
  14. 37
  15. 33
  16. 9
  17. 12
  18. 8
  19. 3
  20. 21
  21. 7
  22. 3
  23. 2
  24. 60
  25. 22
  26. 45
  27. 5
  28. 2
  29. 6
  30. 7
  31. 22
  32. 7
  33. 23
  34. 14
  35. 13
  36. 36
  37. 5
  38. 10
  39. 6
  40. 6

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