Ответ:
Y^2 = 9X^2 - 60X + 100
- X^2 + X*( 3X - 10) - 9X^2 + 60X - 100 - 20 = 0
X^2 + 3X^2 - 10X - 9X^2 + 60X - 120 = 0
- 5X^2 + 50X - 120 = 0
D = 2500 - 2400 =100 ; V D =10
X1 = ( - 50 + 10 ) : ( - 10 ) = 4
X2 = ( - 60 ) : ( - 10 ) = 6
Y = 3X - 10
Y1 = 12 - 10 = 2
Y2= 18 - 10 = 8
Ответ ( 4 ; 2 ) ; ( 6 ; 8 )