In order to solve an equation using a table, first press
and enter the left side of the equation for
and the right side of the equation for
.
This can be any type of equation (linear, quadratic, polynomial, exponential)
and the procedure is unchanged. For the equation
, the screen should appear as shown below:
Now press 2nd, then press GRAPH. Exactly
what is seen will depend on the Table Settings (TBLSET). On the
calculator image below, the settings were TBLStart=0 and
=1.
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Now search up and down the list with the UP and DOWN
ARROWS keeping the blacken highlighted area in the X column until two
identical or almost identical numbers in the
and
columns are found. For this example, the Y columns are equal
when X = 7 since both
and
are equal to 11.
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The X Value that makes
=
is the solution to the equation
.
Thus, the solution is X = 7.
It may be necessary to adjust the table setting to get the numbers in the Y columns to be equal, or at least almost equal.
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