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The image you've uploaded contains a set of matrix-related problems. Here’s a breakdown of the first few problems, along with their respective questions:

1. **Question 1:** Given the matrices \( A = \begin{bmatrix} 15 & 3 \\ 9 & 5 \end{bmatrix} \) and \( B = \begin{bmatrix} 2 & x \\ 3 & 10 \end{bmatrix} \), and the matrix \( C = \begin{bmatrix} 1 & -4 \\ 3 & -13 \end{bmatrix} \), find the value of \( x \) from the equation \( A - B = C^1 \).
    - Possible answers: \( a. 3, b. 5, c. 7, d. 9, e. 11 \).

2. **Question 2:** Given the matrices \( A = \begin{bmatrix} 3 & 0 \\ 2 & 5 \end{bmatrix} \), \( B = \begin{bmatrix} x & -1 \\ 2 & 3 \end{bmatrix} \), and \( C = \begin{bmatrix} 0 & 1 \\ -15 & 5 \end{bmatrix} \), with \( A' \) as the transpose of matrix \( A \), if \( A' \cdot B = C \), what is the value of \( x + y \)?
    - Possible answers: \( a. -4, b. -1, c. 1, d. 5, e. 7 \).

3. **Question 3:** For a 2x2 matrix \( X \) satisfying \( \begin{bmatrix} 1 & 2 \\ 3 & 4 \end{bmatrix} \begin{bmatrix} 4 & 3 \\ 2 & 1 \end{bmatrix} = X \), the matrix \( X \) is:
    - Possible answers: \( a. \begin{bmatrix} -6 & -5 \\ 4 & 2 \end{bmatrix}, b. \begin{bmatrix} 12 & 10 \\ 6 & 5 \end{bmatrix}, c. \begin{bmatrix} -6 & -5 \\ 4 & 5 \end{bmatrix}, d. \begin{bmatrix} 12 & 10 \\ 10 & 8 \end{bmatrix} \).

Do you want to work through one of these problems step by step? Feel free to ask for clarification or additional information. 

### Related Questions:
1. How do you compute the transpose of a matrix?
2. What is the method to find the inverse of a matrix?
3. How can matrix multiplication be applied to solve system of equations?
4. What are the properties of matrix determinants?
5. How do you solve a matrix equation involving identity matrices?

**Tip:** When dealing with matrix equations, carefully check matrix dimensions to ensure operations like addition, subtraction, and multiplication are valid.

Diketahui matriks A = [15 3; 9 5] dan B = [2 x; 3 10] dan C = [1 -4; 3 -13]. Bila x merupakan penyelesaian dari persamaan A - B = C^1, maka nilai x adalah...

Learn how to solve for x in the matrix equation A - B = C, where A, B, and C are given matrices. This problem covers the fundamental concept of matrix subtraction and equality. Suitable for high school students in Grades 11-12.

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