[" points "A(2,-2)" and "B(3,n)" ."],[" .Find a relation between "x" and "y" if the points "(x,y),(1,2)" and "(7,0)" are collinear."],[" .Find a relation between "x" assing through the points "(6,-6)" ,(3,"-7)" and "(3,3).],[" 3.Find the centre of a circle passing through the points "(6,-6)" .Find the coordinates of the "],[" .Find the centre of a square are "(-1,2)" and "(3,2)" .Find the coordinates of the "]