Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 543 · 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: 6(t − 3) = 3t + 3. What is t?
2. 2.Solve: 3(m − 3) = m + 3. What is m?
3. 3.Solve: 5y + 18 = 2y + 63. What is y?
4. 4.Solve: 3(y − 1) = y + 3. What is y?
5. 5.Solve: 6(m − 1) = 3m + 39. What is m?
6. 6.A father is 26 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?
7. 7.Solve: 5(t − 1) = 3t + 1. What is t?
8. 8.The length of a rectangle is 2 cm more than its width. Its perimeter is 40 cm. What is its width (in cm)?
9. 9.A father is 16 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?
10. 10.The sum of four consecutive whole numbers is 142. What is the smallest of them?
11. 11.Solve: 5x + 13 = 2x + 28. What is x?
12. 12.A father is 7 years older than his son. In 2 years, the father will be twice as old as his son. How old is the son now?
13. 13.The length of a rectangle is 6 cm more than its width. Its perimeter is 84 cm. What is its width (in cm)?
14. 14.Solve: t/6 + t/2 = 8. What is t?
15. 15.The sum of four consecutive whole numbers is 150. What is the largest of them?
16. 16.Solve: m/3 + m/5 = 48. What is m?
17. 17.Solve: 7y + 6 = 4y + 12. What is y?
18. 18.Solve: t/3 + t/6 = 3. What is t?
19. 19.A father is 48 years older than his son. In 6 years, the father will be four times as old as his son. How old is the son now?
20. 20.Solve: 6n + 15 = 4n + 23. What is n?
21. 21.Solve: 3(m − 2) = 2m + 13. What is m?
22. 22.Solve: 3(t − 2) = t + 22. What is t?
23. 23.Solve: t/4 + t/3 = 14. What is t?
24. 24.Solve: 5m + 5 = 2m + 35. What is m?
25. 25.A father is 12 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?
26. 26.A father is 42 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?
27. 27.A father is 7 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
28. 28.The length of a rectangle is 5 cm more than its width. Its perimeter is 126 cm. What is its width (in cm)?
29. 29.Solve: 5p + 18 = p + 66. What is p?
30. 30.Solve: 4m + 18 = 2m + 42. What is m?
31. 31.Solve: y/3 + y/4 = 56. What is y?
32. 32.A father is 18 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?
33. 33.Solve: 4x + 16 = 3x + 26. What is x?
34. 34.The length of a rectangle is 4 cm more than its width. Its perimeter is 28 cm. What is its width (in cm)?
35. 35.A father is 45 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?
36. 36.The length of a rectangle is 11 cm more than its width. Its perimeter is 126 cm. What is its width (in cm)?
37. 37.The length of a rectangle is 12 cm more than its width. Its perimeter is 40 cm. What is its width (in cm)?
38. 38.A father is 11 years older than his son. In 8 years, the father will be twice as old as his son. How old is the son now?
39. 39.Solve: 4(t − 3) = t + 36. What is t?
40. 40.The length of a rectangle is 6 cm more than its width. Its perimeter is 96 cm. What is its width (in cm)?

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