Question 263441
Normally we want
{{{y = mx + b}}}
where m = slope and b = y-intercept.
in our example we have
{{{y = -8/5}}}
which means
{{{y = 0x - 8/5}}}
or m = 0 and b = -8/5.
to graph
first plot -8/5 on the y-axis. 
second move up 0 and over 1 (rise / run) and place a dot.
connect the dots to find a long horizontal line.