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Y is the second number in a set of ordered pairs.
Select any three values of x in the domain of the equation. Solve the equation at these three points for the other variable, y. Then each (x, y) will be an ordered pair that is a solution of the equation.
If you are talking about the things in the perentheses, (5,-9), they are called ordered pairs. Ordered pairs help you find a location on a coordinate graph.
The domain and range are the x and y coordinates of the dot, respectively.
You need to know the domain in order to find the range.