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    How would I do this question?

    "Rearrange y = 16 - 4x to make x the subject."
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    (Original post by Jack_Tomlin)
    How would I do this question?

    "Rearrange y = 16 - 4x to make x the subject."
    How would you go about doing it?

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    (Original post by Jack_Tomlin)
    How would I do this question?

    "Rearrange y = 16 - 4x to make x the subject."
    Start by moving everything except 4x on one side, then divide through
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    (Original post by HopelessMedic)
    Start by moving everything except 4x on one side, then divide through
    Ok so far I've got - 16y = -4x
    Is x = -4?
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    You should have taken 16 away from both sides to leave y-16=-4x. The divide through to get x in terms of y
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    (Original post by Jack_Tomlin)
    Ok so far I've got - 16y = -4x
    Is x = -4?
    Remember that you are not solving for an actual value for x, you just want to find what x is in terms of y.
    In your answer you correctly subtracted 16 from the RHS, but have not done the same on the LHS. Instead, you've multiplied the LHS by -16.
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    (Original post by surina16)
    Remember that you are not solving for an actual value for x, you just want to find what x is in terms of y.
    In your answer you correctly subtracted 16 from the RHS, but have not done the same on the LHS. Instead, you've multiplied the LHS by -16.
    Ok would you mind answering the question so I can see all the steps?
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    (Original post by Jack_Tomlin)
    Ok would you mind answering the question so I can see all the steps?
    Sure.

    y = 16 - 4x
    [-16]
    y - 16 = -4x
    [*-1]
    16 - y = 4x
    [/4]
    (16-y)/4 = x

    you can leave it like that, or you can divide the 16 by the 4 to simplify it:
    x = 4 - y/4
    or
    x = 4 - 0.25y which looks tidier imo
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    (Original post by surina16)
    Sure.

    y = 16 - 4x
    [-16]
    y - 16 = -4x
    [*-1]
    16 - y = 4x
    [/4]
    (16-y)/4 = x

    you can leave it like that, or you can divide the 16 by the 4 to simplify it:
    x = 4 - y/4
    or
    x = 4 - 0.25y which looks tidier imo
    Thanks
 
 
 
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