The answer is (-63, 0)
To get this answer, you multiply each coordinate by the scale factor 9. So you'll have -7*9 = -63 and 0*9 = 0.
When the center of dilation is (0, 0), you can simply multiply every coordinate value by the dilation factor.
L' = 9×L = (9×(-7), 9×0)
L' = (-63, 0)
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