The tangent function's asymptotes are this type of line.
If a line with this property is tangent to a curve at point A, the curve is not differentiable at A. The tangent function's asymptotes are this type of line. If a line of this type passes through the graph of a relation twice, the relation is (*) not a function, which is called the namesake "test" of this type of line. For 10 points, give this term that describes lines like x=3, which have undefined slope and are perpendicular to horizontal lines.
If a line with this property is tangent to a curve at point A, the curve is not differentiable at A.
vertical line(s)