https://s.wordpress.com/latex.php?latex=y%3D%5Cfrac%7B1%7D%7B2%7D%282-%5Cfrac%7B1%7D%7B2%7D%29x-%283%29%282%29%28-%5Cfrac%7B1%7D%7B2%7D%29&bg=FFFFFF&fg=000000&s=0