Dashed or solid parabola, in graphing??

Question

when is the parabola dashed and when is it solid??

Answer 1

If you are graphing quadratic equations (that is, they have an equal sign), the parabola will always be solid.



If you are graphing a quadratic inequality, then you may have to use a dashed line. Dashed lines are used when the inequality is "greater than" or "less than." Solid lines are used when the inequality is "greater than or equal to" or "less than or equal to."



The only time you might have an extra dashed line on a graph of a parabola is if you are drawing the directrix of the parabola. It is dashed because it is not technically a part of the actual graph of the function. The parabola itself would be solid, assuming it is an equation and not one of the inequalities mentioned above.

Answer 2

Graphing Inequalities Parabola

Answer 3

Parabola dashed is a parabolic curve with only some of the points on the parabola plotted.

Parabola solid is a continuous line through the points plotted on the dashed parabola.

Answer 4

The only time it's dashed is when you have an inequality with a strict greater than or less than.



It's solid the rest of the time (including greater than or equal to)



At least I think that's what it is (it's been 20 years since I did that kind of problem.)

Answer 5

If it is just a line then it is SOLID :



y = x^2 draw solid line, no shading

______________________________



If it is a boundary,



It is SOLID if the boundary includes the points on the parabola

(there is an =):



y <= x^2 shade area below parabola, solid line

y >= x^2 shade area above parabola, solid line

______________________________



It is DOTTED if the boundary does not include the points on the parabola (no = sign):



y < x^2 shade area below parabola, dotted line

y > x^2 shade area above parabola, dotted line

Answer 6

it's usually dashed when the equation is an inequality and it's solid when it's and equations with "=" sign.