Question 246708
Rewrite the equations in slope-intercept form (y = mx + b)
{{{y-6=3x}}}
{{{y=3x+6}}}
.
{{{3x+y=8}}}
{{{y=-3x+8}}}
.
{{{3y-6x=9}}}
{{{3y=6x+9}}}
{{{y=(6x/3)+(9/3)}}}
{{{y=2x+3}}}
.
{{{2x+y=-4}}}
{{{y=-2x-4}}}
.
{{{5y-25=15x}}}
{{{5y=15x+25}}}
{{{y=(15x/5)+(25/5)}}}
{{{y=3x+5}}}
.
{{{6y-6x=6}}}
{{{6y=6x+6}}}
Now divide by 6 on both sides and simplify.  
I'll let you finish this one.  :)