# Casio fx 991 ES PLUS feature

1. Sep 3, 2015

### Raghav Gupta

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. Sep 3, 2015

### CalcNerd

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

Last edited: Sep 3, 2015