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Casio fx 991 ES PLUS feature

  1. Sep 3, 2015 #1
    How can we solve equation with 4 variables in this calculator?
    For 3 it solves in equation mode. Or the 4x4 matrix is not there?

    Can the calculator show graphs?
  2. jcsd
  3. Sep 3, 2015 #2


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    Education Advisor
    Gold Member

    4x4 matrix is NOT there. Nor are there any graphing features, the dot matrix display allows for viewing equations.
    Last edited: Sep 3, 2015
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