The elements in the second row and first column of the matrix `[(4,5,6),(7,8,9)]` is _______.

Options

A. 7
B. 8
C. 5
D. 6

Answer

To find the element in the second row and first column of the given matrix, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Matrix**: The matrix given is `[(4, 5, 6), (7, 8, 9)]`. This can be visualized as:
```
Row 1: 4 5 6
Row 2: 7 8 9
```

2. **Count the Rows**: In the matrix, we have two rows:
- Row 1: (4, 5, 6)
- Row 2: (7, 8, 9)

3. **Identify the Second Row**: The second row of the matrix is (7, 8, 9).

4. **Count the Columns**: Each row has three columns:
- Column 1: 4 (from Row 1), 7 (from Row 2)
- Column 2: 5 (from Row 1), 8 (from Row 2)
- Column 3: 6 (from Row 1), 9 (from Row 2)

5. **Identify the First Column**: The first column consists of the elements 4 and 7.

6. **Find the Intersection**: The intersection of the second row and the first column is the element located in the second row and first column, which is 7.

### Final Answer:
The element in the second row and first column of the matrix is **7**.

---