First find the length between the midsegment point and coordinate B. The difference between 0 and -3 is 3. Thus, half the line is 3. So, to get to A, we have to go 3 in the other direction. -3 and 3 more would make Coordinate A land on (-6,2)

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x-coordinate: abscissa

y-coordinate: ordinate

A coordinate plane! If it has one or more breaks in it is not a coordinate plane but only a part of one.

...both electrons in the covalent bond are supplied by the same atom.