For my 3D Graph my equation was x+y+z=3 and my equation assigned for me was -x+y+z. so I had to make a 3D model of (-3,3,3). My section of the model is only a slice of the pizza, so there is still 7 pieces. Once we put them all together, it makes a diamond. Our models should all look the same, the only thing different is where we position it.