Unit Test Answers

Which graph represents the equation y2 = –4x?

A parabola is represented by the equation x2 = 4y.

A parabola has a vertex at (0,0). The focus of the parabola is located on the positive x-axis.

A parabola can be represented by the equation x2 = –20y.

A parabola has a vertex at (0,0). The focus of the parabola is located on the positive y-axis.

A parabola can be represented by the equation y2 = –x.

On a coordinate plane, a parabola opens upward. It has a vertex at (0, 0), a focus at (0, 1.5) and a directrix at y = negative 1.5.

A general formula for a parabola is y2=4px.What is the value of p in the equation y2=−4x?

A parabola, with its vertex at (0,0), has a focus on the negative part of the y-axis.Which statements about the parabola are true? Select two options.The directrix will cross through the positive part of the y-axis.The equation of the parabola will be in the form y2 = 4px where the value of p is negative.The equation of the parabola will be in the form x2 = 4py where the value of p is positive.The equation of the parabola could be y2 = 4x.The equation of the parabola could be x2 = y.

A parabola has a vertex at the origin. The equation of the directrix of the parabola is y = 3.

A parabola has a vertex at (0,0). The focus of the parabola is located at (4,0).What is the equation of the directrix?

A parabola has a vertex at (0,0). The equation for the directrix of the parabola is x = –4.

A parabola is represented by the equation y2 = 5x.