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TAC470
Given the points 𝐴 (2, 9), 𝐵 (−3, 1) and 𝐶 (10, −2), Which of the following points could be the fourth vertex of parallelogram 𝐴𝐵𝐶𝐷?

A. (8,−11)
B. ( 5,8 )
C. (15,6 )
D. (5,−6)
E. None of these.

shouldn't the answer be D? if not please explain why
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TAC470
Given the points 𝐴 (2, 9), 𝐵 (−3, 1) and 𝐶 (10, −2), Which of the following points could be the fourth vertex of parallelogram 𝐴𝐵𝐶𝐷?

A. (8,−11)
B. ( 5,8 )
C. (15,6 )
D. (5,−6)
E. None of these.

Opposite side should be parallel.
So AB || CD and both have same slope.
If (x1,y1) and (x2,y2) are 2 points on the same line then slope is given by (y2-y1)/(x2-x1)

Slope of AB = (1-9)/(-5) = 8/5
Slope of BC = (y+2)/(x-10) = 8/5

Looking at answer choices, substituting (15,6) for (x,y) satisfies the equation.
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Since gmat worksheet is grided worksheet, can we just draw and work it out?
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