9X^2 - 14X = 9X - 14 9X^2 - 23X + 14 = 0 D = 529 - 504 = 25 ; √ D = 5 X1 = (23 + 5 ) : 18 = 28 : 18 = 14/9 = 1 5/9 X2 = ( 23 - 5 ) : 18 = 1 Y = 9X - 14 Y1 = 14 - 14 = 0 Y2 = 9 - 14 = ( - 5 )