How to determine if an equation is a function without graphing

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How to Determine If an Equation Is a Linear Function Without

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How to tell if an equation is a function without graphing

But in my notes it showed another way to prove a function is one to one but I am not sure if I am Stack Exchange Network Stack Exchange network consists of 182 Q&A communities including

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How Can You Tell if a Relation is Not a Function?

Solving for y is one way to determine whether an equation is a function or not without a graph. Make sure each value of x gives one and only one value of y; if any value of x (x is in the domain

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