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Thread: co-ordinate geometry..looks simlple..but there is a catch

  1. #1
    Within my grasp! mauni is on the way! mauni's Avatar
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    co-ordinate geometry..looks simlple..but there is a catch

    In the rectangular coordinate system, if line a is parallel to one of the axes, does line a contain the point (4, 5) ?

    (1) Line a contains the point (4, -5).
    (2) Line a crosses the x-axis.

    ans:
    SPOILER:
    c



    I thought it would be an 'a' ... but the answer is different..can anyone tell me the role of stmt 2
    thank you

    mauni

  2. #2
    lsr
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    Quote Originally Posted by mauni View Post
    In the rectangular coordinate system, if line a is parallel to one of the axes, does line a contain the point (4, 5) ?

    (1) Line a contains the point (4, -5).
    (2) Line a crosses the x-axis.

    ans:
    SPOILER:
    c



    I thought it would be an 'a' ... but the answer is different..can anyone tell me the role of stmt 2
    The line can be parallel to either the x-axis or the y-axis.

    If a line contains the point (a,b) and is parallel to the y-axis, then the line's equation is x=a; where the line will contain only points (a,y) for all values of y.

    If a line contains the point (a,b) and is parallel to the x-axis, then the line's equation is y=b; where the line will contain only points (x,b) for all values of x.

    Either line's equetion x=4 or y=5 will satisfy the conditions of the question stem.

    First statement:
    The line's equetion is either x=4 or y=-5
    Not sufficient.

    Second statement:
    The line is parallel to the y-axis.
    Not sufficient.

    Both statements:
    The line's equation is x=4.
    Sufficient.

    Answer is C.

  3. #3
    Within my grasp! ken_english is on the way! ken_english's Avatar
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    C for me too

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    Eager! krishna_k1 just joined TestMagic.
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    C for me too.

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    Learning never Stops ! bads123 just joined TestMagic.
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    IMO C
    Good explanation lsr.

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    TestMagic Guru-in-Training nikiforos just joined TestMagic. nikiforos's Avatar
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    Another vote for C

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