# Algebra Help

• Nov 4th 2005, 08:55 AM
christkd
Serious help needed for easy questions
well ive been give a series of questions although ive forgotton the method to solve most of them ive managed to get them done through books and the internet, there is a few i couldnt get done. id be greatful if some1 would point me in the right direction.

a) evaluate 1-a/a-1 when a = x+y/x-y.

b) simpilify (2/x + 5/y / 8y/x - 20x/y)

c) i have 2 complex numbers z1 and z2, z1-z2 = 5

z1 = x + i/2 - i
and
z2 = y/3 + 2i

how would i go about finding x and y?

thanks very much
• Nov 4th 2005, 10:11 AM
Jameson
Here's help for the first one...

$\frac{a-1}{1-a}=\frac{a-1}{-(a-1)}$
• Nov 5th 2005, 05:08 AM
christkd
thanks very much for ur help