Texas Instruments TI-80 User Manual - Page 109
Drawing Horizontal and Vertical Lines
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Drawing Horizontal and Vertical Lines While a graph is displayed, HORIZONTAL and VERTICAL let you define lines on the graph using the cursor. If a graph is not displayed, the instruction is copied to the Home screen. Directly on a Graph To draw horizontal and vertical lines directly on a graph: 1. When a graph is displayed, select HORIZONTAL (item 3) or VERTICAL (item 4) from the DRAW DRAW menu. 2. A line is displayed that moves as you move the cursor. Position the cursor where you want to draw the line. Press ¸. The line is drawn on the graph. From the Home Screen or a Program To continue to draw lines, repeat step 2. To cancel HORIZONTAL or VERTICAL, press M. HORIZONTAL (DRAW DRAW, item 3) draws a horizontal line at Y=Y (which can be an expression, but not a list). HORIZONTAL Y VERTICAL (DRAW DRAW, item 4) draws a vertical line at X=X (which can be an expression, but not a list). VERTICAL X Note: In the example above, the horizontal line is drawn first, and then the vertical line is drawn. Draw Operations 7-5