It is not possible. Several (4) straight lines without lifting your pen is possible but 1 line is not.
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If it is not straight, then it is not a line.
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.
These terms describe functions.A continuous function looks like a straight line or a curve, depending on if it is linear or quadratic.A discrete function looks like dots on a number line, only covering the integers, instead of numbers in between.
A tangent line is a line that is parallel to and intersecting a point on a curve, where the limit of the distance between two points on that curve (one of them being the point in question) and those two points also being on that line approaches zero. Since a straight line has only one slope, at all points on the line, then there can only be one tangent line to a straight line, and the tangent line is the same line as the straight line.
A semicircle?