Assertion: parabola's directrix | /r/HasProperty | horizontal line
Facets:
value: down from the vertex
type: LOCATION
value: opposite of the focus
type: OTHER
value: with the equation
type: OTHER
Source sentences:
text: If the equation of a parabola is written in standard form and p is negative and the directrix is a horizontal line, then what can we conclude about its graph?
text: If the equation of a parabola is written in standard form and p is positive and the directrix is a vertical line, then what can we conclude about its graph?
text: To derive an equation for a parabola, let's suppose (for now) that the directrix is horizontal and therefore has the equation:
text: Because this is a horizontal parabola and the axis of symmetry is horizontal, the directrix will be vertical.
text: The directrix is a horizontal line 5 units down from the vertex.
text: If we consider only parabolas that open upwards or downwards, then the directrix will be a horizontal line of the form y = c .
text: If the equation of a parabola is written in standard form and [latex]p[/latex] is negative and the directrix is a horizontal line, then what can we conclude about its graph?
text: Please notice that we know that the parabola opens upward or downward, because the directrix is a horizontal line:
text: c, the directrix is a horizontal line with the equation
text: The directrix is an horizontal line; since this line is perpendicular to the axis of symmetry, then this must be a regular parabola, where the x part is squared.
text: The directrix of the parabola is the horizontal line on the side of the vertex opposite of the focus.
text: The directrix is a vertical line
text: The focus will be to the right of the vertex, and the directrix will be a vertical line that is the same distance to the left of the vertex that the focus is to the right.
text: This means that the coordinate for the focus is (4, -3), and the directrix will be a vertical line going through the point (-2, -3).
text: If the equation of a parabola is written in standard form and [latex]p[/latex] is positive and the directrix is a vertical line, then what can we conclude about its graph?
text: Since the directrix is horizontal, the distance between the point and the line is simply D 2 =
text: Since the parabola is vertical, your directrix should be horizontal.