Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 217 · 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 15 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?
2. 2.Solve: 5m + 19 = m + 55. What is m?
3. 3.Solve: 7x + 10 = 2x + 15. What is x?
4. 4.Solve: 3t + 3 = t + 9. What is t?
5. 5.Solve: 4x + 2 = 2x + 4. What is x?
6. 6.Solve: p/4 + p/3 = 42. What is p?
7. 7.The sum of three consecutive whole numbers is 150. What is the smallest of them?
8. 8.The length of a rectangle is 9 cm more than its width. Its perimeter is 78 cm. What is its width (in cm)?
9. 9.The length of a rectangle is 9 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
10. 10.Solve: p/2 + p/6 = 24. What is p?
11. 11.Solve: 5(t − 4) = 4t + 8. What is t?
12. 12.Solve: 4n + 16 = 2n + 28. What is n?
13. 13.The length of a rectangle is 7 cm more than its width. Its perimeter is 114 cm. What is its width (in cm)?
14. 14.A father is 38 years older than his son. In 7 years, the father will be three times as old as his son. How old is the son now?
15. 15.The length of a rectangle is 14 cm more than its width. Its perimeter is 88 cm. What is its width (in cm)?
16. 16.A father is 5 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
17. 17.The sum of four consecutive whole numbers is 46. What is the smallest of them?
18. 18.Solve: 9t + 1 = 7t + 27. What is t?
19. 19.A father is 26 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?
20. 20.Solve: 8p + 6 = 6p + 10. What is p?
21. 21.The sum of three consecutive whole numbers is 129. What is the largest of them?
22. 22.The length of a rectangle is 12 cm more than its width. Its perimeter is 76 cm. What is its width (in cm)?
23. 23.The length of a rectangle is 12 cm more than its width. Its perimeter is 128 cm. What is its width (in cm)?
24. 24.Solve: 3(n − 2) = n + 26. What is n?
25. 25.Solve: 3(t − 1) = 2t + 13. What is t?
26. 26.The sum of two consecutive whole numbers is 79. What is the smallest of them?
27. 27.The sum of four consecutive whole numbers is 206. What is the smallest of them?
28. 28.The sum of three consecutive whole numbers is 114. What is the largest of them?
29. 29.The length of a rectangle is 10 cm more than its width. Its perimeter is 40 cm. What is its width (in cm)?
30. 30.The sum of three consecutive whole numbers is 102. What is the largest of them?
31. 31.Solve: 4(p − 5) = 2p + 6. What is p?
32. 32.Solve: 5(t − 2) = t + 10. What is t?
33. 33.Solve: 6(m − 2) = m + 53. What is m?
34. 34.The length of a rectangle is 11 cm more than its width. Its perimeter is 62 cm. What is its width (in cm)?
35. 35.A father is 14 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
36. 36.Solve: 8x + 4 = 3x + 64. What is x?
37. 37.Solve: 3(x − 4) = 2x + 3. What is x?
38. 38.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?
39. 39.Solve: t/6 + t/2 = 12. What is t?
40. 40.Solve: 8y + 6 = 7y + 18. What is y?

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