Sorry, this is not a graphical calculator, it is just a normal scientific calculator, it doesn't have the matrix feature.
But you can use the simultaneous equations in 3 unknowns to solve. It is in the Mode key..

You go to YouTube, search keywords "Casio fx570ms simultaneous equations", there are a few videos showing you the steps how to key in the 3 equations value and solve them. Learn it, save a lot of time solving them manually..