Can somebody me with this question

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

Another type of subtraction equation is 16-b=7. explain how you would sole this equation then solve it.

Find the value of x. give reasons to justify your solutions! l, m ∈ kn