[tex]1.\\Communicative\ proprety:\\\\a+b=b+a\\\\Answer:\\b.\ 18+30=30+18[/tex]
[tex]1.\\y=mx+b\\\\m-a\ slope\\\\b-y-intercept\\-----------\\\\10y-5x=40\ \ \ /+5x\\10y=5x+40\ \ \ /:10\\y=0.5x+4\to m=0.5\ and\ b=4\\\\Answer:\\d.\ The\ y-itercept\ is\ 4\ and\ the\ slope\ is\ 0.5[/tex]