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Yes but it is not a straight line because it looks like an umbrella and it is called a parabola

Q: Is a graph of a quadratic function a line?

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It is the axis of symmetry.

No vertical line will intersect the graph in more than one point. The fundamental flaw is that no graph can show that it does not happen beyond the domain of the graph.

The parabola

The real solutions are the points at which the graph of the function crosses the x-axis. If the graph never crosses the x-axis, then the solutions are imaginary.

No. It can also be a circle, ellipse or hyperbola.

Related questions

the graph of a quadratic function is a parabola. hope this helps xP

It is the axis of symmetry.

No vertical line will intersect the graph in more than one point. The fundamental flaw is that no graph can show that it does not happen beyond the domain of the graph.

The zeros of a quadratic function, if they exist, are the values of the variable at which the graph crosses the horizontal axis.

Yes. And the question is ...

The parabola

Some do and some don't. It's possible but not necessary.

The real solutions are the points at which the graph of the function crosses the x-axis. If the graph never crosses the x-axis, then the solutions are imaginary.

Yes.

That the function is a quadratic expression.

Yes the graph of a function can be a vertical or a horizontal line

Yes the graph of a function can be a vertical or a horizontal line