Question 1091607
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X-coordinate of the point B is the sum  Bx = Mx + (Mx - Ax) = -2 + (-2 - (-8)) = -2 + (-2 + 8) = -2 + 6 = 4.

y-coordinate of the point B is the sum  By = My + (My - Ay) = 1 + (1 - 3)     =  1 - 2 = -1.


<U>Answer</U>.  B = (4,-1).
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<U>HINT</U>. To make it clear, plot these points in a graph paper.