Originally Posted by

**philipishin** When we graph a points, it is different from y=ax+b(or y=x) as y=x is line but the point (x,y) is number so location for point is number. And sometimes, point(location) can be infinite series, so it is not number. And it means the math(graph) is not the real number for (x,y) point location as y for x is changing for y=x graph as line. So y=x graph is not kind like sequence equation (when it is point) but it is another method to understand math for number. So point(location) is not accurate number.