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## headge 3 years ago When you get a fraction like this: 20y/40 - 57y/40, can I swap it to 57y/40 - 20y/40?

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1. headge

@kathyforver

2. headge

@kathyforever

3. headge

Yes no, maybe, I don't know

4. kathyforever

im not completely sure. i think so but i may be wrong

5. headge

@Hero

6. headge

@TuringTest

7. Agent47

One does not simply swap the fractions whenever he or she feels like it!

8. headge

AAAAAAAAAAAAARRRRRRRRRRRR

9. Agent47

you could swap it to: -57y/50+20y/40 though

10. headge

What is 20y/40 - 57y/40?

11. Agent47

addition is commutative, but subtraction is not.

12. cshalvey

@headge - Do you understand negative numbers? So, in this example it's okay for the answer to be less than zero, or rewrite it as @Agent47 has done.

13. headge

Why is the 57y now over 50?

14. MarkRijckenberg

To answer your question, you need to simplify the issue. You need to put y/40 outside the brackets and the remaining numbers inside the brackets. Then you will see that 20-57 is definitely not the same value as 57-20

15. headge

Be arsed douing that!

16. headge

doing

17. headge

Mark you look like billy corgan. So I will write the question out in full

18. cshalvey

Now *that's* an excellent example there @MarkRijckenberg @headge - I'd be careful about how I interact with the people who are helping you, ok? Now, what part of this problem don't you understand? Did Mark's example help?

19. headge

Y/2 - 5y/8 + 4y/5 = 20y/40 - 25y/40 + 32y/40 = 20y/40 - 57y/40 Then I got stuck. What do you mean? What have I said that is rude?

20. cshalvey

Hmm, so now I'm confused. Are you supposed to solve for y in this problem? In terms of your original question, are you able to do that part? 20 - 57 = ?

21. headge

Write is as a single fraction

22. headge

And I've not been rude to Mark

23. cshalvey

Ok, understood. So, are you able to subtract 20y from 57y? An easier way to think of it is by adding a negative, as @Agent47 did. So, -57 + 20 = ? (this answer will be a negative number FYI)

24. headge

So it could be 37y/40?

25. headge

-

26. headge

-37y/40?

27. headge

There she goes, there she goes again. She calls my name!

28. headge

D:

29. headge

@MarkRijckenberg

30. cshalvey

Hehe, sorry, connection issues. But yes, you got it! It's -37y/40 :)

31. headge

I didn't know you were able to get a -y thing!

32. headge

Alright I'll give you best response

33. MarkRijckenberg

I disagree: Y/2 - 5y/8 + 4y/5 = 20y/40 - 25y/40 + 32y/40 = -5y/40 + 32y/40 = 27y/40

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