Treat the given nonlinear functions as linear functions in order to sketch their graphs. At times, this can be useful in showing certain values of a function. For example, y = 2 + 3x² can be shown as a straight line by graphing y as a function of x² . A table of values for this graph is shown along with the corresponding graph in Fig. 21.29.

The current i (in A) in a certain electric circuit is given by i = 6(1 − e^−t). Sketch this as a linear function.

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X 0 x² 0 y 2 1 2 3 4 5 14 4 9 16 25 5 14 29 50 77