Posted by **Claire** on Wednesday, November 21, 2007 at 4:06pm.

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!

- maths pls help -
**bobpursley**, Wednesday, November 21, 2007 at 4:27pm
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.

- maths pls help -
**Claire**, Wednesday, November 21, 2007 at 4:40pm
I still cannot work them out!!

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