Explanation:
if y was 0 then
0 - 2 = 2(x+2)
-2=2x+4
-6=2x
-3
if y was 1 then
1 - 2 = 2(x+2)
-1=2x+4
-5=2x
-2.5
now if y was 2 then
2 - 2 = 2(x+2)
0 = 2x + 4
-4=2x
-2
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