Functions and Graphs with The TI-92
Mr R Oxley RVS Offerton High School
We are looking to make designs using line graphs and possibly quadratics
To start with input the functions y = x; y = 2x; y = 3x and y = 4x
The Graph Screen will now look like this.
We can make the lines slope the "other way" by putting a minus (-) sign infront of the "x" number.
The design looks better if it keeps its symmetry.
We can use "Split Screen Mode" to view both the Function and the Graph screens.
We can produce "shallow lines" by putting decimals less than 1 infront of the "x".
The Split Screen Mode lets us see which functions are required to keep the design symmetrical.
We can get horizontal lines by inputing y = 1; y = 2; y = -1; y = -2 etc.
Horizontal lines and sloping lines combine well to make an interesting design.
For extension work we could look at curved graphs. These are called Quadratics and are found by inputing y = x * x ; y = 2x * x ; y = -x * x and so on.