Inverse Matrices and Solving Simultaneous Equations Using Matrices (VCE SSCE General Mathematics): Quizzes

The identity matrix $I$

$\begin{bmatrix} 1 & 0 \\ 0 & 1 \end{bmatrix}$

Square matrices only

$ad - bc$

When its determinant equals zero

$7$

Coefficients of variables

$X = A^{-1} \times C$

No, order matters in multiplication

Calculate $A \times B$ and check if it equals $I$