138 Chapter 2 Linear Equations in Two Variables and Functions Calculator Connections Topic: Using the Table and Graph Features A viewing window of a graphing calculator shows a portion of a rectangular coordinate system.The standard viewing window for most calculators shows both the x- and y-axes between 10 and 10. Furthermore, the scale defined by the tick marks on both axes is usually set to 1. The standard viewing window is shown here. Linear equations can be analyzed with a graphing calculator. • It is important to isolate the y-variable in the equation.Then enter the equation in the calculator. For example, to enter the equation from Example 5, we have: 2x 4y 8 4y 2x 8 4y 4 2x 4 y 1 2 8 4 x 2 • A Table feature can be used to find many solutions to an equation. Several solutions to are shown here. y 1 2 x 2 • A Graph feature can be used to graph a line. Sometimes the standard viewing window does not provide an adequate display for the graph of an equation. For example, in the standard viewing window, the graph of yx 15 is visible only in a small portion of the upper right corner. To see the x- and y-intercepts of this line, we can change the viewing window to accommodate larger values of x and y. Most calculators have a Range or Window feature that enables the user to change the minimum and maximum x- and y-values. In this case, we changed the values of x to range between 5 and 20, and the values of y to range between 10 and 20.We also changed the scaling for the x- and y-axes so that the tick marks appear in increments of 5 (Xscl 5 and Yscl 5).
miller_intermediate_algebra_4e_ch1_3
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