anonymous
  • anonymous
When you get a fraction like this: 20y/40 - 57y/40, can I swap it to 57y/40 - 20y/40?
Mathematics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
anonymous
  • anonymous
anonymous
  • anonymous
Yes no, maybe, I don't know

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anonymous
  • anonymous
im not completely sure. i think so but i may be wrong
anonymous
  • anonymous
anonymous
  • anonymous
Agent47
  • Agent47
One does not simply swap the fractions whenever he or she feels like it!
anonymous
  • anonymous
AAAAAAAAAAAAARRRRRRRRRRRR
Agent47
  • Agent47
you could swap it to: -57y/50+20y/40 though
anonymous
  • anonymous
What is 20y/40 - 57y/40?
Agent47
  • Agent47
addition is commutative, but subtraction is not.
anonymous
  • anonymous
@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.
anonymous
  • anonymous
Why is the 57y now over 50?
MarkRijckenberg
  • 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
anonymous
  • anonymous
Be arsed douing that!
anonymous
  • anonymous
doing
anonymous
  • anonymous
Mark you look like billy corgan. So I will write the question out in full
anonymous
  • anonymous
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?
anonymous
  • anonymous
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?
anonymous
  • anonymous
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 = ?
anonymous
  • anonymous
Write is as a single fraction
anonymous
  • anonymous
And I've not been rude to Mark
anonymous
  • anonymous
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)
anonymous
  • anonymous
So it could be 37y/40?
anonymous
  • anonymous
-
anonymous
  • anonymous
-37y/40?
anonymous
  • anonymous
There she goes, there she goes again. She calls my name!
anonymous
  • anonymous
D:
anonymous
  • anonymous
anonymous
  • anonymous
Hehe, sorry, connection issues. But yes, you got it! It's -37y/40 :)
anonymous
  • anonymous
I didn't know you were able to get a -y thing!
anonymous
  • anonymous
Alright I'll give you best response
MarkRijckenberg
  • 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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