Question

Which system of equations matches the graph below?
http://learn.flvs.net/webdav/assessment_images/educator_algebra2_v10/5_15g_04.gif


y = –x2 if x –1
y = x – 1 if x > 0

y = –x2 if x 0
y = x – 1 if x > 0

y = x – 1 if x 1
y = –x2 if x > 1

y = –x2 if x 1
y = x – 1 if x > 1
I've been stuck on this problem forever and I can't figure it out... If you could tell me how you got the answer so I can know how to answer it when the test comes it would be greatly apprciated