Keyboard Access (all models): the key.X Y X/Y [N-vector] [[N×N-matrix]] [N-vector] [[1×N-matrix]] [[N×N-matrix]] [[1×N-matrix]]
Also, in HP49G+/50G: RS+NUM.SLV SYS
Division, analytic function.
Matrix shortcut: Since a/b is mathematically identical to (1/b)*a, HP allows the use of as a shortcut for matrix multiplication by an inverse. If you have two matrices on the stack (or an array and a matrix), you can just press (instead of 1/X SWAP * ) to do such things as solve systems of linear equations.
Example: Solve this system of linear equations:
This means that x=5 and y=9. This works for any number of variables; just divide the constants by the coefficients to find the solutions.
HP49/50 maximum integer inputs: no limit.