CPM Homework Banner

Home > PC3 > Chapter 13 > Lesson 13.1.1 > Problem 13-14


Write the equation of each conic described below.

  1. A circle whose center lies on the line . The circle has a radius of and is tangent to the -axis.

    The -coordinate of the circle must be either or . Why?

  2. A parabola with the focus at and a directrix of .

    This parabola opens to the left. Why?
    Sketch the situation to help locate the vertex and determine the value of .

    Review the Math Notes box in Lesson 11.1.5.