Solve for the Variables of the Coordinates

Jan 2017
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The point (15, 4) is the midpoint of C and D. Given that the coordinates of C are (9, s) and the coordinates of D are (t, 4), solve for the values of the variables s and t. Show your work to prove your answer.

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skeeter

Math Team
Jul 2011
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Texas
The point (15, 4) is the midpoint of C and D. Given that the coordinates of C are (9, s) and the coordinates of D are (t, 4), solve for the values of the variables s and t. Show your work to prove your answer.
$\dfrac{9+t}{2} = 15$

$\dfrac{s+4}{2} = 4$

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