SOLUTION: why is the line x=4 a vertical line?

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Question 178757This question is from textbook Introduction and Intermediate algebra
: why is the line x=4 a vertical line? This question is from textbook Introduction and Intermediate algebra

Answer by Mathtut(3670)   (Show Source): You can put this solution on YOUR website!
because for every value of y the value of x is 4.....this creates a vertical line at x=4
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