Use matrices to find the vertices of the image of the square with the given vertices after

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Use matrices to find the vertices of the image of the square with the given vertices after the given transformation. Then sketch the square and its image.
1. (0, 0), (0, 3), (3, 0), (3, 3); horizontal stretch, k = 2
2. (1, 2), (3, 2), (1, 4), (3, 4); reflection in the x-axis
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