Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 282 · 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.Solve: 4(x − 1) = 3x + 5. What is x?
2. 2.Solve: 7n + 1 = 4n + 34. What is n?
3. 3.Solve: 3n + 19 = n + 39. What is n?
4. 4.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?
5. 5.The sum of three consecutive whole numbers is 123. What is the largest of them?
6. 6.A father is 51 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?
7. 7.Solve: 4y + 2 = y + 11. What is y?
8. 8.Solve: 3(y − 3) = 2y + 10. What is y?
9. 9.Solve: 6(m − 1) = m + 59. What is m?
10. 10.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?
11. 11.A father is 8 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?
12. 12.Solve: 3m + 18 = m + 22. What is m?
13. 13.The length of a rectangle is 12 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
14. 14.The sum of two consecutive whole numbers is 49. What is the largest of them?
15. 15.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?
16. 16.Solve: 4(p − 1) = 2p + 18. What is p?
17. 17.The length of a rectangle is 2 cm more than its width. Its perimeter is 116 cm. What is its width (in cm)?
18. 18.The length of a rectangle is 2 cm more than its width. Its perimeter is 76 cm. What is its width (in cm)?
19. 19.A father is 26 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?
20. 20.The sum of three consecutive whole numbers is 78. What is the smallest of them?
21. 21.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?
22. 22.Solve: 3x + 15 = 2x + 24. What is x?
23. 23.Solve: 6(n − 5) = 4n + 24. What is n?
24. 24.The sum of four consecutive whole numbers is 118. What is the smallest of them?
25. 25.The sum of four consecutive whole numbers is 50. What is the largest of them?
26. 26.Solve: y/3 + y/4 = 56. What is y?
27. 27.The length of a rectangle is 14 cm more than its width. Its perimeter is 100 cm. What is its width (in cm)?
28. 28.Solve: 5(p − 5) = 2p + 17. What is p?
29. 29.The sum of four consecutive whole numbers is 30. What is the largest of them?
30. 30.Solve: t/6 + t/5 = 44. What is t?
31. 31.The length of a rectangle is 11 cm more than its width. Its perimeter is 78 cm. What is its width (in cm)?
32. 32.Solve: 6y + 18 = 4y + 30. What is y?
33. 33.The sum of three consecutive whole numbers is 66. What is the largest of them?
34. 34.Solve: 6(n − 1) = 4n + 8. What is n?
35. 35.The sum of three consecutive whole numbers is 96. What is the smallest of them?
36. 36.The length of a rectangle is 10 cm more than its width. Its perimeter is 128 cm. What is its width (in cm)?
37. 37.Solve: 4t + 2 = 3t + 10. What is t?
38. 38.The sum of three consecutive whole numbers is 111. What is the largest of them?
39. 39.A father is 28 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?
40. 40.The sum of four consecutive whole numbers is 222. What is the smallest of them?

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