Write an equation of the circle that has a a diameter with end points (-18,3). The generic equation is (x-h)^2 +(y-k)^2 =r^2. where (h, k) are the coordinates for the center of the circle, and r is the radius

Four equations are shown below.equation 1: y=2*equation 2: y=2x-5equation 3: y=x2 + 6equation 4: tdentify one linear equation and one nonlinear equation from the list.why each equation you identified is linear or nonlinear.nd one nonlinear equation from the list. state a reasonlinear equation