Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 578 · 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.The length of a rectangle is 10 cm more than its width. Its perimeter is 112 cm. What is its width (in cm)?
2. 2.The length of a rectangle is 4 cm more than its width. Its perimeter is 68 cm. What is its width (in cm)?
3. 3.Solve: 5y + 13 = 3y + 17. What is y?
4. 4.The length of a rectangle is 10 cm more than its width. Its perimeter is 32 cm. What is its width (in cm)?
5. 5.A father is 33 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?
6. 6.A father is 21 years older than his son. In 1 year, the father will be four times as old as his son. How old is the son now?
7. 7.Solve: 6(x − 5) = 4x + 2. What is x?
8. 8.The length of a rectangle is 7 cm more than its width. Its perimeter is 34 cm. What is its width (in cm)?
9. 9.Solve: 4(x − 1) = x + 38. What is x?
10. 10.Solve: 5x + 19 = x + 51. What is x?
11. 11.Solve: y/3 + y/4 = 49. What is y?
12. 12.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?
13. 13.The length of a rectangle is 4 cm more than its width. Its perimeter is 44 cm. What is its width (in cm)?
14. 14.The sum of three consecutive whole numbers is 105. What is the smallest of them?
15. 15.The sum of two consecutive whole numbers is 121. What is the smallest of them?
16. 16.A father is 11 years older than his son. In 6 years, the father will be twice as old as his son. How old is the son now?
17. 17.A father is 3 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
18. 18.The length of a rectangle is 13 cm more than its width. Its perimeter is 142 cm. What is its width (in cm)?
19. 19.Solve: n/2 + n/4 = 12. What is n?
20. 20.The sum of three consecutive whole numbers is 144. What is the smallest of them?
21. 21.The length of a rectangle is 7 cm more than its width. Its perimeter is 50 cm. What is its width (in cm)?
22. 22.Solve: x/6 + x/3 = 15. What is x?
23. 23.Solve: p/4 + p/5 = 63. What is p?
24. 24.The sum of two consecutive whole numbers is 99. What is the largest of them?
25. 25.The sum of three consecutive whole numbers is 162. What is the smallest of them?
26. 26.A father is 11 years older than his son. In 5 years, the father will be twice as old as his son. How old is the son now?
27. 27.The sum of three consecutive whole numbers is 123. What is the largest of them?
28. 28.Solve: 5(m − 3) = 2m + 24. What is m?
29. 29.Solve: x/4 + x/5 = 36. What is x?
30. 30.Solve: p/6 + p/2 = 16. What is p?
31. 31.The length of a rectangle is 13 cm more than its width. Its perimeter is 98 cm. What is its width (in cm)?
32. 32.Solve: p/5 + p/4 = 9. What is p?
33. 33.Solve: 6(y − 5) = 3y + 33. What is y?
34. 34.Solve: 4x + 16 = x + 46. What is x?
35. 35.The length of a rectangle is 6 cm more than its width. Its perimeter is 20 cm. What is its width (in cm)?
36. 36.The length of a rectangle is 14 cm more than its width. Its perimeter is 112 cm. What is its width (in cm)?
37. 37.Solve: 5(y − 3) = 3y + 21. What is y?
38. 38.Solve: 9n + 16 = 5n + 28. What is n?
39. 39.The sum of two consecutive whole numbers is 49. What is the smallest of them?
40. 40.Solve: 3(y − 2) = 2y + 11. What is y?

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