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ACT® Math

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Moderate

Find the Missing Endpoint, Given One Endpoint and the Midpoint

ACTMAT-HH6DQJ

The midpoint, $M$, of segment $\overline { JK }$ is $\left( -1,1 \right)$ . Point $J$ has coordinates $\left( 3,9 \right)$.

What are the coordinates of point $K$?

A

$\left( 1,5 \right)$

B

$\left( -5,-7 \right)$

C

$\left( 5,7 \right)$

D

$\left( 7,17 \right)$

E

$\left( -2,-4 \right)$