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5.4 Finding intercepts and intersections

5.4.1 y-intercept and trace

We can use the calculator to approximate x and y intercepts. We begin with

the function y = 2x + 1. Both graphically and algebraically it is easy to see

that the graph crosses at (0, 1). We wish to use the calculator to check our

conclusion. Be sure that the graph is chosen as the active window. We know

that x = 0 for any y-intercept, we can use the Trace feature to ﬁnd the value

of y. Choose Analysis from the menu bar then Trace.

Note that the cursor is blinking on a speciﬁc coordinate. The initial coor-

dinate may not be the same for every calculator. This would depend on

previous use of trace. From this screen, the calculator has a hidden feature

that allows the user to trace any (x, y) when x is speciﬁed. If we use our

keypad or keyboard to enter the value 0, we see a hidden evaluation feature.

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Casio Spreadsheet Application Guía de usuario Pagina 31