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concept check - That makes a vertical line since the y axis...

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The line x = 4 is a vertical line because the y value is not specified by the equation. Y can vary to any value, while  still meeting the requirement of the equation: that x is equal to 4. Therefore, any point where x is 4 is on the line. 
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Unformatted text preview: That makes a vertical line, since the y axis is vertical, and we need all the points along y, where x is 4....
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