Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 656 · 40 sums

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.

1. 1.A father is 16 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?
2. 2.Solve: y/5 + y/2 = 14. What is y?
3. 3.The length of a rectangle is 13 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
4. 4.Solve: 5(x − 1) = 2x + 1. What is x?
5. 5.Solve: y/2 + y/6 = 24. What is y?
6. 6.Solve: 4(t − 4) = 2t + 4. What is t?
7. 7.A father is 34 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?
8. 8.Solve: 8m + 4 = 5m + 19. What is m?
9. 9.Solve: 8t + 19 = 4t + 63. What is t?
10. 10.A father is 30 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?
11. 11.Solve: x/4 + x/5 = 18. What is x?
12. 12.The sum of two consecutive whole numbers is 121. What is the largest of them?
13. 13.A father is 36 years older than his son. In 2 years, the father will be four times as old as his son. How old is the son now?
14. 14.The sum of four consecutive whole numbers is 230. What is the smallest of them?
15. 15.Solve: 9p + 12 = 3p + 42. What is p?
16. 16.The sum of two consecutive whole numbers is 97. What is the smallest of them?
17. 17.The sum of two consecutive whole numbers is 71. What is the smallest of them?
18. 18.The sum of three consecutive whole numbers is 72. What is the largest of them?
19. 19.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?
20. 20.The length of a rectangle is 12 cm more than its width. Its perimeter is 92 cm. What is its width (in cm)?
21. 21.The length of a rectangle is 3 cm more than its width. Its perimeter is 122 cm. What is its width (in cm)?
22. 22.Solve: 7x + 10 = 6x + 18. What is x?
23. 23.Solve: p/4 + p/5 = 54. What is p?
24. 24.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?
25. 25.Solve: 6(y − 5) = 5y + 5. What is y?
26. 26.Solve: 9m + 7 = 4m + 47. What is m?
27. 27.Solve: y/4 + y/3 = 49. What is y?
28. 28.Solve: 7m + 14 = 4m + 59. What is m?
29. 29.Solve: 6t + 9 = 5t + 15. What is t?
30. 30.The sum of three consecutive whole numbers is 57. What is the largest of them?
31. 31.A father is 14 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
32. 32.Solve: 9m + 4 = 3m + 52. What is m?
33. 33.A father is 36 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?
34. 34.Solve: 3(x − 1) = x + 13. What is x?
35. 35.Solve: 3(m − 2) = 2m + 13. What is m?
36. 36.The sum of four consecutive whole numbers is 78. What is the largest of them?
37. 37.Solve: x/6 + x/3 = 24. What is x?
38. 38.Solve: 9x + 13 = 5x + 69. What is x?
39. 39.A father is 18 years older than his son. In 4 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 1 cm more than its width. Its perimeter is 26 cm. What is its width (in cm)?

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