Investigate by calculating which of the points [[$ (1, 2) $]], [[$ (2, 6) $]] and [[$ (4, 5) $]] are on a line [[$ y = x + 1 $]].



Answer:
[[$ (1, 2) $]] is is not on the line.
[[$ (2, 6) $]] is is not on the line.
[[$ (4, 5) $]] is is not on the line.