To solve a set of eqns 2x+3y=5;3x+15y=8, the correct Matlab input is
[2 3 ; 3 15] / [5 ; 8]
[2 3 ; 3 15] \ [5 ; 8]
[2 3;3 15] / [5 8]
[2 3;3 15] \ [5 8]