Definitions for "Ordered pair"
A pair of numbers in which the order is specified, used to locate a point in a coordinate plane
Set of two numbers in which the order has an agreed-upon meaning, such as the Cartesian coordinates (x, y), where the first coordinate represents the horizontal position, and the second coordinate represents the vertical position.
(3) Two numbers in a specific order used to locate a point on a coordinate grid. They are usually written inside parentheses: (2,3). The horizontal coordinate x is given first; the vertical coordinate y is given second.
Keywords:  son, father, elements, two, list
an ordered set of two elements
A list of two elements, such as (father, son) or (5, 2).
a set of the form ( x , y ), where x and y represent whatever individuals are being considered at a particular moment
Keywords:  equations, solution, systems
a solution of a systems of equations if it is a solution for each of the equations