10 But the graphs which should contain, besides the normal sitter, representations of deceased friends.
Another useful set of graphs comprises those which give the relation between the expressions of a length, volume, &c., on different systems of measurement.
In particular, the equality or inequality of values of two functions is more readily grasped by comparison of the lengths of the ordinates of the graphs than by inspection of the relative positions of their bounding lines.
The second class of cases comprises equations involving two unknowns; here we have to deal with two graphs, and the solution of the equation is the determination of their common ordinates.
[[Mensuration Of Graphs 38.]] (A) Preliminary.
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