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The equation x=c where c is a constant is the equation of a vertical line. It can't be a function but it is linear so the answer is no.

For example, the vertical line produced by the linear equation x = 3 does not represent a function. We cannot write this equation so that y is a function of x because the only x-value is 3 and this "maps" to every real-number y.

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Q: Are all linear equations functions why or why not?
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