### Home > A2C > Chapter 6 > Lesson 6.1.2 > Problem 6-29

6-29.

Write the equation of a circle with a center at -axis (in other words, it touches the

*-axis at only one point). Sketching a picture will help.*

Since the circle is tangent to the *y*-axis, the length of the radius will be equal to the distance from the center to the *y*-axis.

Use the eTool below to graph the equation.

Click the link at right for the full version of the eTool: *6-29 HW eTool*