f(g(x) = x, so it is the straight line through the origin, with a slope of 1.
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A linear graph shows a linear equation in which the value of one variable depends on the value of the other variable.
A graph that shows proportions of different parts (of a whole) is a Pie chart.
A pie graph shows parts of a whole
A bar graph shows discreet data, but other types can also.
A line graph shows a trend over time.