The abscissa and the ordinate.
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An ordered pair has two values. You need to define the absolute value of an ordered pair before the question can be answered. There are many possible metrics.
Plug your ordered pair into both of your equations to see if you get they work.
ordered pair
ordered pair
The idea is to replace one variable in the equation by the first number in the ordered pair, the other variable with the second number in the ordered pair, do the calculations, and see whether the resulting expressions are indeed equal.