Question 19139
You need to change it into {{{y=mx+b}}}form. 
{{{3y=x}}}
Divide both sides by 3
{{{y=1/3(x)}}}
Your slope is {{{1/3}}} and your Y-intercept is 0
{{{graph(300,200,-5,5,-5,5,(1/3)x)}}}
Hope this helps!