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The equation of the line x = 4 has no term for y in the equation. Therefore any value of y can be used and the x coordinate is still equal 4. So a straight vertical line, crossing the x axis at (4,0) is the only line which satisfies these conditions.

You can plot some points: (4,0); (4,100); (4,-5265), etc. and then connect the dots to see that it is a straight vertical line.

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14y ago

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Q: Why the line x equals 4 is a vertical line?
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