Technology: A graphing calculator can be used to evaluate expressions by using the store-to-memory key (STO► or →), to store values of variables.

Example: Evaluate 4a+3b if a= 18 and b= -26

Store the values of a and b in the memory:

18 STO► A ENTER

-26 STO► B ENTER

Input the expression using the ALPHA key to input the variables:

4 A + 3 B ENTER

The answer is -6

Now I understand how to do everything on my calculator up to the ALPHA key part. Now I cant find the ALPHA key on my claculator but it does have the [STO►] key. Now I am assuming since it has that key it should have the ALPHA key.

So my questions are:

Is the key on my caculator? If so, where?

How do I use it?

My calculator:

http://www.maplin.co.uk/images/Full/A97F