On a coordinate plane, solid circles appear at the following points: (negative 2, negative 5), (negative 1, 3), (1, negative 2), (3, 0), (4, negative 2), (4, 4). which explains why the graph is not a function? it is not a function because the points are not connected to each other. it is not a function because the points are not related by a single equation. it is not a function because there are two different x-values for a single y-value. it is not a function because there are two different y-values for a single x-value.