HP Prime Graphing NW280AAABA manual Solving systems of linear equations, Q1 n AQ2

This operation is not a mathematical division: it is a left- multiplication by the inverse of the divisor. M1/M2 is equivalent to M2–1* M1.

To divide the two matrices you created for the previous example, press the following keys:

AQ1 n AQ2

To invert a matrix You can invert a square matrix in Home view by typing the matrix (or its variable name) and pressing SnE. You can also use the INVERSE command in the Matrix category of the Math menu.

To negate each You can change the sign of each element in a matrix by

elementpressing Q, entering the matrix name, and pressing E.

Solving systems of linear equations

You can use matrices to solve systems of linear equations, such as the following:

2x+3y+4z=5

x+y–z=7

4x–y+2z=1

In this example we will use matrices M1 and M2, but you could use any available matrix variable name.

1.Open the Matrix Catalog, clear M1, choose to create a vector, and open the Matrix Editor:

St

[press =or \to select M1]

C E

472 Matrices