Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 378 · 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 6 years older than his son. In 1 year, the father will be three times as old as his son. How old is the son now?
2. 2.The sum of two consecutive whole numbers is 15. What is the largest of them?
3. 3.The sum of four consecutive whole numbers is 70. What is the largest of them?
4. 4.Solve: 4(n − 4) = 3n + 4. What is n?
5. 5.Solve: m/6 + m/2 = 16. What is m?
6. 6.A father is 60 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?
7. 7.Solve: 3(m − 5) = 2m + 2. What is m?
8. 8.The length of a rectangle is 7 cm more than its width. Its perimeter is 134 cm. What is its width (in cm)?
9. 9.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?
10. 10.A father is 24 years older than his son. In 3 years, the father will be four times as old as his son. How old is the son now?
11. 11.Solve: 4m + 14 = 2m + 16. What is m?
12. 12.Solve: 5y + 2 = 3y + 20. What is y?
13. 13.The sum of four consecutive whole numbers is 70. What is the smallest of them?
14. 14.Solve: 6n + 13 = n + 68. What is n?
15. 15.Solve: 6(x − 1) = 5x + 1. What is x?
16. 16.The length of a rectangle is 11 cm more than its width. Its perimeter is 74 cm. What is its width (in cm)?
17. 17.The length of a rectangle is 2 cm more than its width. Its perimeter is 76 cm. What is its width (in cm)?
18. 18.Solve: 5x + 9 = 3x + 15. What is x?
19. 19.Solve: p/3 + p/6 = 12. What is p?
20. 20.The length of a rectangle is 3 cm more than its width. Its perimeter is 86 cm. What is its width (in cm)?
21. 21.Solve: 6(n − 2) = 4n + 10. What is n?
22. 22.Solve: 5(n − 2) = 2n + 32. What is n?
23. 23.Solve: 6p + 17 = 3p + 47. What is p?
24. 24.Solve: 6n + 12 = 4n + 16. What is n?
25. 25.The sum of two consecutive whole numbers is 35. What is the largest of them?
26. 26.Solve: x/5 + x/6 = 11. What is x?
27. 27.A father is 18 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?
28. 28.Solve: t/2 + t/5 = 49. What is t?
29. 29.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?
30. 30.The length of a rectangle is 8 cm more than its width. Its perimeter is 84 cm. What is its width (in cm)?
31. 31.A father is 45 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?
32. 32.Solve: 4p + 8 = 2p + 34. What is p?
33. 33.The sum of three consecutive whole numbers is 66. What is the smallest of them?
34. 34.Solve: 3(y − 4) = 2y + 11. What is y?
35. 35.Solve: 6y + 18 = 5y + 28. What is y?
36. 36.A father is 18 years older than his son. In 1 year, the father will be three times as old as his son. How old is the son now?
37. 37.Solve: 5(t − 3) = 3t + 5. What is t?
38. 38.The sum of two consecutive whole numbers is 41. What is the largest of them?
39. 39.Solve: 9y + 4 = 5y + 60. What is y?
40. 40.Solve: 4n + 6 = 3n + 14. What is n?

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