Question 1178820
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Vector CA has components  dx = 7 - (-1) = 8  and  dy = 4 - (-4) = 8:

       CA = (8,8).


Therefore, vector CB has components (2,2).


Hence, the point B has coordinates  x= -1+2 = 1  and  y = -4 + 2 = -2:

       B = (1,-2).
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Solved.