If you had a grid handy, that would help my explanation a lot. First mark 0,0 on your grid. Then draw a line where x = -2 (this should just be a vertical line that intersects (-2,0)). Notice how 0,0 is 2 units away from that line? In order to show a reflection, add 2 units on the other side of the x=-2 line. Mark that dot. Make sure the y value is the same. The x value should be -4.
FIRST REFLECTION: (-4,0)
Onto the second reflection! This is over the y-axis, but since the first reflection is already on the y-axis it wouldn't change.
