Finding the Equation of the Circle with a given line and tangent x axis

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So my Professor ask us to solve a problem finding the equation of the circle with only a given

"Tangent to the x-axis with center on x + 4y = 5"

I'm confused in the part how do I find the center point in a line without a given endpoints of the line?

What I think about the problem is that the center would be along the given line and the x intercept would be the point where the circle touches

Edit: after analyzing how it could be done. I found out that it really isn't a unique circle, the center and the x axis can be adjusted to match the given.

This is the first graph of equation

This is another one that was adjusted

My problem now is how do I create an differential equation of family of circles that would only satisfy the given problem.

Sorry I'm new, thank you for everyone's kind response

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There are obviously not a unique one but multiple ( an infinite set) circle solutions.

enter image description here

They can be set by a variable center point given on the given parametrized straight line

$$ (x_C,y_C)=(t, \frac{5-t}{4})$$

You can find them all

$$ (x-x_C)^2+(y-y_C)^2= y_C^2.$$

Find the equation of Circle in the question misleads.