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Page 7 gives instructions for graphing lines. Additional instructions are in Appendix B. |
Example
1
Try graphing the equation y = (1/2)x, y
= x, y = 4x on the same screen.
Press GRAPH after entering equations.
Notice how each graph is steeping than the previous one. This is the slope of the line. Experiment with different slopes. i.e. y = -2x, y = -(1/2)x
y = mx where m is the slope of the line
Press the Y =
key (noted by a red dot)
Notice the = signs are highlighted. Highlighting the = signs turns the equations on which allows you to see their graphs when GRAPH is pressed.
I pressed TRACE after pressing GRAPH. Use the arrow keys to move left and right along Y1 (equation 1) . Use the arrows keys
(up and down) to scroll between each equation.
If you don't see the expression in the upper
left-hand corner, press 2nd
FORMAT, (above ZOOM key) and make sure everything is highlighted on the left hand side.
If you don't see the coordinates (x =, y = ) following above instructions.
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Let's look at the y-intercept y = mx + b where m = slope and b = y-intercept |
Notice the y-intercept for Y1 is (0,0)
Notice the y-intercept for Y2 is (0,5)
Remember to press TRACE to see equations and coordinates.
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Shading isn't difficult and can help you tremendously in chapter 1 |
Notice the triangle to the left of Y1.
y £ -x + 2
Place your cursor to the left of Y1 and press ENTER . There are 7 different lime modes available. Try them all!!
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Here is the key to shading with the TI-83 |
- Solve for y
- Use the lower-left triangle for £ (less than or equal to) i.e. example above
- Use upper-right triangle of ³ ( greater than or equal to)