In order to find an intersection point, first graph two functions.  For this example, let and .  The graphs of the functions in a standard window are shown below.

Screen Picture of TI-83 Calculator Screen Picture of TI-83 Calculator

The intersection point of the two lines is not visible using a standard window. Zoom out once so that the intersection point is visible.  (Remember to press ENTER for the zoom out to happen).  Now press 2nd and then TRACE [Calc] to get the CALCULATE menu.  Select 5:intersect.

Screen Picture of TI-83 Calculator Screen Picture of the TI-83 Calculator

If the cursor is not near the intersection point, move it close to the point of intersection using the ARROW keys, then press ENTER.

Screen Picture of TI-83 Calculator Screen Picture of TI-83 Calculator

When Second curve? appears, press ENTER again.   When Guess? appears, press ENTER once more.

Screen Picture of TI-83 Calculator Screen Picture of TI-83 Calculator
Screen Picture of TI-83 Calculator


The final screen shows that the intersection point is (7,11). If there are more points of intersection, move the cursor near each one and repeat the process.



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