What are the dimensions of the matrix?

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The matrix is a × matrix.

Explanation:

The dimensions of a matrix is the number of rows × the number of columns of the matrix.

Your matrix is garbled. Thus, to help you I will work with an hypothetical matrix.

Assume the matrix:

That matrix has four colums and 3 rows.

For instance, the first colum is:

                   Thus, it has 4 columns.

And the second row is:

                  Thus, it has 3 rows.

Hence,  the matrix is 3 × 4.

The first number is the number of rows and the second number is the number of columnns.

look at the picture.

y-intercept for the function on a picture is 4 → point (0, 4).

y-intercept for the function

is for x = 0. substitute:

y-intercept is 8 → point (0, 8).