Darkness_hacker99 SG http://www.google.com.sg/url?sa=t&rct=j&q=&esrc=s&frm=1&source=web&cd=4&ved=0CDwQFjAD&url=http%3A%2F%2Fchoosgs3math.wiki.hci.edu.sg%2Ffile%2Fview%2FLinear%2BLaw.ppt&ei=1OBTUOPVE8r5rAfO6YDoBg&usg=AFQjCNFyKY5pj1pSz0zrgmpEv-pfzJ9x5g&sig2=HtsJIyUm7RS54Zoph4yMVQ&cad=rjaDownload the PPT. Hope it helps.
wee_ws SG Hi, For (a), consider taking the reciprocal of both sides. For (c), consider dividing both sides by x. Thanks.Cheers, Wen Shih