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    Rearange: 84=m/n -9, to make n the subject of the formula, when i rearange this i get either: n= 93/m or n= m/93, which one is right?
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    (Original post by background)
    Rearange: 84=m/n -9, to make n the subject of the formula, when i rearange this i get either: n= 93/m or n= m/93, which one is right?
    Substitute you're answers into the equation to see which one is right.
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    84 = m/n -9
    To get n on its on, multiply both sides by n to get rid of the fraction, this should give you the following:
    84n = m -9
    Now divide both sides by 84, to get n on its own, this should give you the following:
    n = m-9/84
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    One is right, one wrong. Show us your working.
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    (Original post by JTran38)
    84 = m/n -9
    To get n on its on, multiply both sides by n to get rid of the fraction, this should give you the following:
    84n = m -9
    Now divide both sides by 84, to get n on its own, this should give you the following:
    n = m-9/84

    93=m/n
    93/m=n, or i can do your method, why is your method right and my method wrong?
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    (Original post by background)
    93=m/n
    93/m=n, or i can do your method, why is your method right and my method wrong?
    I hope I'm doing this right _gcx . This is from my memory and it might be shoddy lel.

    If I'm wrong ... Add 9 to both sides, then multiply n to get rid of the fraction and go from there.

    P.S: Good I came across this and had a go
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    (Original post by chazwomaq)
    One is right, one wrong. Show us your working.
    method 1: 84=m/n-9 add 9
    93=m/n divide by m
    93/m=n

    method2:

    84=m/n -9 add 9
    93=m/n multiply by n
    93(n)=m divide by 93
    n=m/93
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    (Original post by background)
    93=m/n
    93/m=n, or i can do your method, why is your method right and my method wrong?
    Remember this:

    Whatever you do to one side of the equation, you MUST do to the other side.

    93 = \frac{m}{n}

    Multiply BOTH side by n:

    93n = \frac{mn}{n}

    n now appears in both the numerator and denominator on the right hand side.

    Any number divided by itself = 1

    i.e.

    \frac{n}{n} = 1

    hence

    93n = \frac{mn}{n} = m \rm {x} 1} = m

    93n = m
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    (Original post by background)
    method 1: 84=m/n-9 add 9
    93=m/n divide by m
    93/m=n
    m/n divided by m is not n.
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    (Original post by background)
    method 1: 84=m/n-9 add 9
    93=m/n divide by m
    93/m=n
    OK - here's your mistake. You didn't handle the RHS correctly.
 
 
 
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