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    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.
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    (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 :shock:
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    (Original post by ghostwalker)

    Bostock & Chandler :shock:
    Bet it's not the original Bostock & Chandler!
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    (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.
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    (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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