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

13-14.

Write the equation of each conic described below.

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 eitheror. Why?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.