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How do you find the missing endpoint when the midpoint and one of the endpoints are given to you. Is there an easy way besides using the formula? The midpoint is ( 5,-3) and the point is ( 3, -10)
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by Sofiya143 at October 15, 2011

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Midpoint Formula: [(x₁+x₂)/2,(y₁+y₂)/2] Plugging in values: (x₁+3)/2 = 5; x₁= 7 (y₁-3)/2 = -10; y₁ = -17

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karrjg October 17, 2011