Question 451241


{{{y=3-x}}}.....->... {{{y=-x+3}}}
{{{3x + 3y =9 }}}.....->...  {{{y =-3x/3+9/3 }}}.....->...  {{{y =-x+3 }}}

as you can see, it's about one single line:

{{{ graph( 500, 500, -10, 10, -10, 10, -x+3) }}}