Verified Answer :

apologiabiology

that is called the identity line

x=y
y=x

some points are
(1,1)
(2,2)
(0,0)
(z,z)
(π,π)
as long as the 2 numbers are same, it's on the graph


it looks like a diagonal line that goes from bottom left corner to top right corner
makes 2 triangles

View image apologiabiology

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