Can the Casio fx-991ES PLUS Solve Equations with 4 Variables or Display Graphs?

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Raghav Gupta
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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?
 

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4x4 matrix is NOT there. Nor are there any graphing features, the dot matrix display allows for viewing equations.
 
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