maths pls help
posted by Claire on .
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!

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
y1= log3 x
but y= 2log3 x then solve. 
I still cannot work them out!!

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

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

I am having problems in mmeasuring.