Out of all of my summer work i dont understand graphing...can somwone please help???x;-2

Let us divide your
question:

We have the equation let us say Y such
that:

y = x    when x values between -2 and
0

Now let us substitute with -2 and 0 fopr y
values:

x = -2 ==> y = -2   Then we have the
coordinates (-2, -2)

x = 0 ==> y= 0  Then we have
the coordinates (0,0)

Then we draw a line between both
points, We note that we have open interval so we draw emty circle to indicate that 0 and
2 are not in the interval but the values approches
them.

Now for the other
part:

y= x+ 1   when x values between 0 and
4

x= 0 ==> y= 1    Then the coordinate is (0,
1)

x= 4 ==> y= 5  Thenb the coordinate is
(4,5)

So we draw a line between both points with open
intervals at both points.