Final answer:
An example of a matrix that is 1-1 when letting ___ is the identity matrix.
Step-by-step explanation:
One example of a matrix that is 1-1 when letting ___ is the identity matrix. The identity matrix is a square matrix where all the elements on the main diagonal are 1 and all the other elements are 0.
For instance, let A be a 2x2 identity matrix:
1001
When we let x and y be vectors in R^2, the system of equations Ax = Ay would imply x = y, showing that the matrix A is 1-1.