#TI-Basic, 52 44 42 bytes
TI-Basic, 52 44 42 bytes
GridOff
AxesOff
11
Shade(-Ans,Ans,Xmin,Xmin/3
Shade(-Ans,Ans,Xmax/3,Xmax,1,1,Ans
(assumes a default [-10,10,1] by [-10,10,1] graph area)
Would be 4 bytes shorter without the first 2 lines, but by default would have axes and would not look as nice.
Looks like this:
If the shading is invalid for the challenge, let me know!
Without the first 2 lines, it looks like this: