Firstly just using y makes very important notions like inverse functions are composition of functions very difficult to impossible to define. I teach an introductory discrete mathematics course at a community college to math and computing majors usually in their sophomore year. Phone support is available Monday-Friday 900AM-1000PM ET.
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As in a game of HORSE or PIG a point in math is an exact location on a plane usually marked by a dot. Lashi Bandara PhD candidate Australian National University Disclosure. If I were to reflect this point across the y-axis it would go all the way to positive 6 5. In modern mathematics a point refers usually to an element of some set called a space.