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A graph is represents a function if for every value x, there is at most one value of y = f(x).
The mode is the most occurring value. The highest percentage in the pie chart (circle graph) is your mode.
Take the largest value in the graph and subtract the smallest value from it.
The x value and the y value are directly and invertly related on a graph. This only occurs in a specific type of graph called a proportional graph.
For a 2-dimensional graph if there is any value of x for which there are more than one values of the graph, then it is not a function. Equivalently, any vertical line can intersect the a function at most once.