Assertion: parabola's line | /r/CapableOf | pass through the vertex
Facets:
Source sentences:
text: The line that passes through the vertex and focus is called the axis of symmetry (see Figure 1.)
text: The line of symmetry goes through the vertex, and since we are now only dealing with parabolas that go up and down, the line of symmetry must be a vertical line that will begin with "x = _ ".
text: Another aid to use when graphing parabolas is the axis of symmetry; a parabola is symmetric about a vertical line that runs through the vertex.
text: Parabolas are symmetric, and their lines of symmetry pass through the vertex.