Suppose the price of land in a city is given by the function P (x, y) = 724 - 10( x - _)- 15(x- 1)2 where P(x,y) is the price of land at the point (x,y) in dollars per square metre and x and y are measured in kilometres. At what point within the city is the price of land highest? O ( 2 , 2 ) 0 ( 1, 2 ) O (1, 1 ) O ( -2 2 ) 0 ( 2.1) O (0,0) O ( 2 2 ) O None of the other answers