Below are the answers key for the Multiple Choice Questions in Differential Equations Part 1.

1. A. Fourth order, first degree

Review: Solution for Number 1

2. C. 2xy dx + (2 + x^{2}) dy = 0

Review: Solution for Number 2

3. C. 2y dx = (x^{2} + 1) dy

Review: Solution for Number 3

4. C. y’ = y / 2x

Review: Solution for Number 4

5. C. 1.55

Review: Solution for Number 5

6. x^{3} – 3y + 2 = 0

Review: Solution for Number 6

7. C. y = x^{2} + C

Review: Solution for Number 7

8. B. sin x cos y = ln (c sin x)

Review: Solution for Number 8

9. C. x^{2} – 2y – 1 = 0

Review: Solution for Number 9

10. B. y(k) = 20 + 5k

Review: Solution for Number 10

11. A. √(x^{2} + y^{2} ) + y = C

Review: Solution for Number 11

12. A. (x – 1) y” – xy’ + y = 0

Review: Solution for Number 12

13. A. y = C (sec x + tan x)

Review: Solution for Number 13

14. D. ln (xy) = x + 2y + C

Review: Solution for Number 14

15. C. x^{2} – 2xy – y^{2} = C

Review: Solution for Number 15

16. B. xy = x^{4} / 4 + C

Review: Solution for Number 16

17. B. x dy – y dx = 0

Review: Solution for Number 17

18. A. 2x dy – y dx = 0

Review: Solution for Number 18

19. A. (y – k) dx – (x – h) dy = 0

Review: Solution for Number 19

20. C. xy” – (y’)3 – y’ = 0

Review: Solution for Number 20

21. C. 92.16

Review: Solution for Number 21

22. B. 116 years

Review: Solution for Number 22

23. A. 6.70%

Review: Solution for Number 23

24. A. y = Ce^{-x}

Review: Solution for Number 24

25. A. 33. 59 min

Review: Solution for Number 25

26. C. 30.45 ft/sec

Review: Solution for Number 26

27. B. 19.53 kg

Review: Solution for Number 27

28. A. 171.24 lbs

Review: Solution for Number 28

29. B. P6,750

Review: Solution for Number 29

30. D. P13,498.60

Review: Solution for Number 30

#### Online Question and Answer in Differential Equations Series

Following is the list of multiple choice questions in this brand new series:

**MCQ in Differential Equations**

**MCQ from Number 1 – 50**Answer key:

**PART 1**

**MCQ from Number 51 – 100**Answer key:

**PART 2**

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