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given that two vertices of a triangle are at (-7,-3) and (-4,8) and the centroid is at (-1,3) find

I) the coordinates of the third


ii) the coordinates of the orthocentre



See the attachment for the solution.
0 0 0
hence we can equate the x coordinates and y coordinates
-1=(-11+x)/3                           3=(5+y)/3
-3=-11+x                                 9=5+y
x=-3+11                                  y=4
2 4 2
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