Class 8 Maths Worksheet: Linear Equations

Maths worksheets lesson 60: Linear equations in one variable · Set 421 · 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: 5y + 10 = 4y + 13. What is y?
2. 2.Solve: m/6 + m/4 = 15. What is m?
3. 3.Solve: t/2 + t/5 = 21. What is t?
4. 4.The length of a rectangle is 6 cm more than its width. Its perimeter is 116 cm. What is its width (in cm)?
5. 5.A father is 30 years older than his son. In 4 years, the father will be four times as old as his son. How old is the son now?
6. 6.The sum of three consecutive whole numbers is 75. What is the smallest of them?
7. 7.Solve: 4(t − 2) = 3t + 7. What is t?
8. 8.Solve: 8y + 6 = 2y + 66. What is y?
9. 9.Solve: 8p + 12 = p + 19. What is p?
10. 10.The length of a rectangle is 5 cm more than its width. Its perimeter is 74 cm. What is its width (in cm)?
11. 11.The length of a rectangle is 13 cm more than its width. Its perimeter is 38 cm. What is its width (in cm)?
12. 12.The sum of two consecutive whole numbers is 19. What is the smallest of them?
13. 13.Solve: 5(y − 3) = 2y + 21. What is y?
14. 14.The sum of four consecutive whole numbers is 34. What is the smallest of them?
15. 15.Solve: t/5 + t/4 = 18. What is t?
16. 16.Solve: t/4 + t/5 = 72. What is t?
17. 17.Solve: 8p + 18 = 4p + 26. What is p?
18. 18.The length of a rectangle is 5 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
19. 19.A father is 8 years older than his son. In 1 year, the father will be twice as old as his son. How old is the son now?
20. 20.The length of a rectangle is 4 cm more than its width. Its perimeter is 16 cm. What is its width (in cm)?
21. 21.The length of a rectangle is 11 cm more than its width. Its perimeter is 54 cm. What is its width (in cm)?
22. 22.A father is 24 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?
23. 23.The length of a rectangle is 7 cm more than its width. Its perimeter is 58 cm. What is its width (in cm)?
24. 24.Solve: 5(y − 2) = 4y + 9. What is y?
25. 25.A father is 33 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.The sum of four consecutive whole numbers is 82. What is the largest of them?
27. 27.A father is 33 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?
28. 28.A father is 30 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?
29. 29.A father is 9 years older than his son. In 3 years, the father will be twice as old as his son. How old is the son now?
30. 30.Solve: p/6 + p/3 = 24. What is p?
31. 31.Solve: 4(x − 3) = x + 6. What is x?
32. 32.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?
33. 33.A father is 20 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?
34. 34.Solve: 3(n − 5) = n + 19. What is n?
35. 35.Solve: 3p + 13 = p + 15. What is p?
36. 36.The sum of two consecutive whole numbers is 81. What is the smallest of them?
37. 37.Solve: 6t + 14 = t + 84. What is t?
38. 38.Solve: 4t + 8 = 2t + 32. What is t?
39. 39.Solve: m/4 + m/2 = 21. What is m?
40. 40.Solve: 6(x − 5) = 5x + 9. What is x?

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