Hang That Poster Properly

Geometry Level 1

Bill Ch'ng is a member of the Science Club and he has to hang a poster on a wall to recruit new members.

The poster is rectangular and its coordinates are at (4,2),(7,8),(7,2),(x,y)(4, 2), (7, 8), (7, 2), (x, y)

What is x+yx + y?

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