2x+1=y

2(-1)+1=-3 x=-1 y=-3

2(0)+1=1 x=0 y=1

2(-2)+1=-5 x=-2 y=-5

2(1)+1=3 x=1 y=3

2(4)+1=9 x=4 y=9

2(-1)+1=-3 x=-1 y=-3

I get
-2 + 1 = -1 , x = -1 y = -1

2(0)+1=1 x=0 y=1

2(-2)+1=-5 x=-2 y=-5
I get
-4 + 1 = -3 you are having trouble here

2(1)+1=3 x=1 y=3

2(4)+1=9 x=4 y=9