Question 1152454
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From B to A is 4 units right and 7 units up.<br>
When the figure is rotated 90 degrees counterclockwise, the "right" becomes "up" and the "up" becomes "left".<br>
The rotation is about vertex B, so from B to the image of A is 4 units up and 7 units left.  7 units left and 4 units up from B(1,-4) is (-6,0).<br>