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# Can't understand proof answer watch

1. I have a question where you are asked to add the <=, => or <=> for the following statement:

'(a, b) is a point on y = 2x - 1' 'b = 2a - 1'

Now I can see that you can definitely say =>

But the other way, I was thinking that b = 2a - 1 is the same as y = 2x - 1 - so can't you say <=>

Anyway the answer in book says =>

Can someone please explain.

Book is Core Maths (for A level) Bostock & Chandler q5A 18 if anyone is interested.
2. (Original post by acomber)
....
From what you've posted, I agree with you.

b=2a-1 implies (a,b) is a point on the line... as well.

So, <=>

Bostock & Chandler
3. (Original post by ghostwalker)

Bostock & Chandler
Bet it's not the original Bostock & Chandler!
4. (Original post by davros)
Bet it's not the original Bostock & Chandler!
Yeah, must be ghostwriters.

Or are Bostock & Chandler like the "Dread pirate Roberts"? They've been around so long.
5. (Original post by ghostwalker)
Yeah, must be ghostwriters.

Or are Bostock & Chandler like the "Dread pirate Roberts"? They've been around so long.
Maybe they've been dumbed-down, sorry I mean "modularized" - you study a module of Bostock and then 3 months later a module of Chandler??

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