Question 1012157
The second equation could be:
{{{y=(1/3)x-1}}}
--OR--
{{{y=1/(3x)-1}}} 
Thus two graphs for the second equation.
.
Red line:
2x+y=-8
y=-2x-8
.
Green line:
y=(1/3)x-1
.
Blue line
y=1/(3x)-1
.
{{{ graph( 500, 500, -10, 10, -10, 10, -2x-8, (1/3)x-1, 1/(3x)-1) }}}