Simultaneous literal equation help!

[Rockim]

Need help with this question

For the simultaneous equation    (x/a)+(y/b)=1 , show that x=y= (ab)/(a+b)

and   

Solve x and y

(a+b)x+cy= bc
(b+c)y+ax= -ab

thanks

[the.watchman]

http://vcenotes.com/forum/index.php/topic,21914.msg234889.html#msg234889 for Q2