### Home > INT3 > Chapter 12 > Lesson 12.1.3 > Problem 12-48

12-48.

A circle with its center on the line

*y*= 3*x*in the first quadrant is tangent to the*y*‑axis. 12-48 HW eTool (Desmos). Desmos Accessibility Homework Help ✎If the radius is 2, what is the equation of the circle?

If the radius is 3, what is the equation of the circle?

What point on the line *y* = 3*x* is 2 units from the *y*-axis?

Use the coordinates of the center and the radius to write an equation in general form.

See part (a).

Use the eTool below for help with this problem.

Click on the link at right for the full eTool version: Int3 12-48 HW eTool