Describe all solutions of Ax = 0 in parametric vector form, where A is row equivalent to the given matrix. 3-12 9 -1 4-3 x= x₂ + x3 (Type an integer or fraction for each matrix element.)

Find two 22 matrices such that |A|+|B|=|A+B|.

Explain how to find the determinant of a 22 matrix.

Determine if the statement is true or false. If the statement is false, then correct it and make it true. For the product of two matrices to be defined, the number of rows of the first matrix must equal the number of columns of the second matrix.