The figure shows a circle in the coordinate plane. The center of the circle is the point Aſh, k). The point B(x, y) is a point on the circle. Triangle ABC is a right triangle, with point the vertex of the right angle. The variable r represents the radius of the circle.

Lian is deciding which of two gyms to join. each gym charges a monthly rate plus a one-time membership fee. lian correctly wrote and solved a system of linear equations by substitution to compare the costs of the memberships. in her work, she substituted an expression for one variable and solved for the other. this resulted in the equation 75 = 75. what can lian conclude? one gym charges $75 per month. each gym charges $75 per month both gyms charge the same monthly rate and the same membership fee. both gyms charge the same monthly rate, but not the same membership fee.