### Home > INT3 > Chapter Ch12 > 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).

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