Question

how do you have a reflection in the x axis, if the shape is already partially in the third and second quadrent of the graph

Answer 1

Its a reflection over an x-axis, whats "positive" goes "negative" and whats "negative" goes "positive" with respect to y.

If a shape
`S` is a subset (made of
`P_2\cup P_3` of quadrants
`Q_2,Q_3` then the part
`P_2` that lies in the second quadrant gets mapped to
`Q_3` and part
`P_3` that lies in third quadrant gets mapped to
`Q_2`

Hope this helps.