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When graphed, a function has any shape so that all vertical lines will cross the graph in at most one point. A relation does not have this condition. One or more vertical lines may (not must) pass thru a relation in more points.
The information must be given on the axis label or in the title of the graph.
The graph must be a straight line, and it must pass through the origin.
That depends. How tough do you think it would be to draw a horizontal line or a slanting line on the wall ?
A vertical line has an undefined slope. If a line is vertical, the horizontal coordinate, commonly known as the x coordinates, must all be the same. If not, the line would not be vertical.