1. Graphing Number Lines Figure 7.1a For Figure 7.1a, Enter the inequality x < 5 in Y1. The inequality symbols are found under the TEST menu. The “less than” symbol is option 5. Y= For Figure 7.1b, Graph the number line. The calculator will test the inequality for x-values and graph an ordered pair (x, 1) for a true inequality and (x, 0) for a false inequality. Figure 7.1b ZOOM6 52nd5TEST Technology 7.1 X,T, ,n 1 of 2

2. Graphing Number Lines Figure 7.1c For Figure 7.1c, Trace and use the arrow keys to display the coordinates graphed. To check the upper bound of a number line, 5, enter the value while tracing. TRACEENTER5 If the upper bound is a solution of the inequality, it will have a y-coordinate of 1. If the upper bound is not a solution of the inequality, it will have a y-coordinate of 0. For x < 5, the upper bound is not a solution and is graphed as (5, 0). Technology 7.1 2 of 2

3. Graphing a Linear Inequality in Two Variables Figure 7.5a For Figure 7.5a, Enter the boundary equation y = x + 5 in Y1. Y=5+ Since the inequality is “greater than,” shade above the boundary line. Use the left arrow key to move left of Y1. ◄◄◄◄◄ Choose the “shade above” option. The calculator will display a blinking triangle above a diagonal. ENTER Technology 7.5 X,T, ,n 1 of 2

4. Graphing a Linear Inequality in Two Variables Figure 7.5b For Figure 7.5b, Graph. GRAPH The calculator display shows the shaded graph; it does not show a dashed or solid boundary line. (-47,47,-31,31) Technology 7.5 2 of 2 Y1 = x + 5