maths pls help

1. Solve the following simultaneous equations:

log2 xy = 7
log2 (x^2/y) = 5

2. If log y x =a and log z x=b where x is not equal to 1, express the following in terms of a and b:

logy (yz)

Solve the following simultaneous equations:

y = 2 log3 x
y+1 = log3 9x

Thanks! I tried to work them out but I couldn't!

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  1. Try this on the first set:
    log (xy)= logx + logy
    log (x^2y)= 2logx + log2

    Those ought to help.

    Try that also on the second.
    On the third,
    y+1= log3 9x = log33^2 x= 2 + log3 x
    y-1= log3 x
    but y= 2log3 x then solve.

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    bobpursley
  2. I still cannot work them out!!

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  3. What problems are you having? Where are you getting stuck?

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  4. I don't know. I simply cannot agree with the answers and I have tried to work them out many times

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  5. I am having problems in mmeasuring.

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