Question 53304
For the first one:
{{{y=-2x-2}}}
This is already in slope intercept form:y=mx+b
(0,b) is the y intercept
m=slope=rise/run
In your case b=(0,-2) and m=-2/1
Plot (0,-2) from there go down 2 (-2) and right 1 and plot a second point (it should be at (1,-4))
Connect the dots and you get:
{{{graph(300,200,-10,10,-10,10,-2x-2)}}}
You're almost there:
{{{3y=-x-6}}}
{{{3y/3=-x/3-6/3}}}
{{{y=(-1/3)x-2}}}
The slope m is -1/3
The y-intercept is (0,-2)
Plot (0,-2) go down (-1) and right (3) and plot another point at (3,-3) connect the dots and get:
{{{graph(300,200,-10,10,-10,10,(-1/3)x-2)}}}

If you need to see the two lines together so that you can find their point of intersection:
{{{graph(300,200,-10,10,-10,10,-2x-2,(-1/3)x-2)}}}
They intercect at the y intersept because they both have a y-intercept of (0,-2)