Given that point A is the midpoint of line segment ED, where E( -1,9) and A(4,5), what is the location of point D?

D(9, 1)

Explanation:

Since A is the midpoint of ED, then;

A = (, )

A(4, 5) ⇒ 4 =   and 5 =

= 4

+ = 8

But = -1, then;

-1 + = 8

= 9

= 5

+ = 10

But = 9, then;

9 +  = 10

 = 1

Therefore, point D has coordinates (9, 1).

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