It is called the abscissa.
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Graphs are a way to organize collected data from a subject.
There are many ways to graph linear equations. One way that will always work it to pick some points, 3 is plenty. Pick and x value, plug it in and then find the y value. You will obtain a set or ordered pairs. Graph these and connect the dots. Voila------------- a line!
When quantities are related this way we say that they are in direct proportion.
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birds of a feather stay together