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Can you help with the following questions:

1. What's the difference between scalar multiplication and matrix multiplication? What would be an example of the two?

2. Indicate whether the matrix is in row-reduced form.

3x + 7y - 8z = 5

x + 3z = -2
4x - 3y = 7

3. Indicate whether the matrix is in row-reduced form.
_ _
| 1 0 0 | -1 |
| 0 1 0 | -2 |
|_0 0 2 | -3_|

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