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Evaluate the function at the first number in the pair. If the answer is not equal to the second value, then the ordered pair cannot be in the function.
If the reflection is over the x value, the x-value does not change.
It is the second number in the pair.
Yes and no. In two-dimensional Cartesian coordinates, the answer is usually yes. So the point (4,7) has x value 4 and y value 7. But there are other uses for ordered pairs. For example in polar coordinates a point is specified by an ordered pair (r, theta), and the second number is an angle. You need to know what context you are working in.
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