How primary consideration decides whether an independent variable belongs in an equation or not?

College Algebra
7th Edition
ISBN:9781305115545
Author:James Stewart, Lothar Redlin, Saleem Watson
Publisher:James Stewart, Lothar Redlin, Saleem Watson
Chapter1: Equations And Graphs
Section: Chapter Questions
Problem 3CC: How do you find x-intercepts and y-intercept of a graph of an equation?
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How primary consideration decides whether an independent variable belongs in an equation or not?

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