Someone said you can write an equation by setting an expression equal to itself. would an equation like this be true? explain.

Which statement is true of the circle and the line described by the nonlinear system shown below? (x-4) ^2 + (y-1) ^2 = 9 y = 2x a. the line is tangent to the circle. b. the line is secant to the circle. c. the line does not intersect the circle. d. the line passes through the center of the circle