Question

х2+ху=2. у-3х=7 помогитееееее

Answer 1

y = 3x + 7
X^2 + x( 3x + 7 ) = 2
X^2 + 3x^2 + 7x - 2 = 0
4x^2 + 7x - 2 = 0
D = 49 + 32 = 81 = 9^2
X1 = ( - 7 + 9 ) : 8 = 0,25
X2 = ( - 7 - 9 ) : 8 = - 2
y = 3x + 7
y1 = 0,75 + 7 = 7,75
y2 = - 6 + 7 = 1
Ответ ( 0,25 ; 7,75 ) ; ( - 2 ; 1 )