Question

ПОМОГИТЕ СРОЧНО!!!даю 40 баллов
Решите систему уравнений:
x^2+5x=6xy+15y-9y^2
3x+2y=7

Answer 1

$left { {{ x^{2} +5x=6xy+15y-9 y^{2} } atop {3x+2y=7}} right.\\ left { {{( x^{2} -6xy+9 y^{2} )+5x-15y=0} atop {3x+2y=7}} right. \\ left { {{(x-3y) ^{2}+5(x-3y)=0 } atop {3x+2y=7}} right. \\ left { {{(x-3y)(x-3y+5)=0} atop {3x+2y=7}} right. \\\ 1)left { {{x-3y=0} atop {3x+2y=7}} right.\\ left { {{x=3y} atop {3*3y+2y=7}} right. \\ left { {{x=3y} atop {11y=7}} right. \\ left { {{y= frac{7}{11} } atop {x=3* frac{7}{11} =1 frac{10}{11} }} right.$

$2) left { {{x-3y+5=0} atop {3x+2y=7}} right. \\ left { {{x=3y-5} atop {3(3y-5)+2y=7}} right.\\ left { {{x=3y-5} atop {9y-15+2y=7}} right.\\ left { {{x=3y-5} atop {11y=22}} right. \\ left { {{y=2} atop {x=3*2-5=1}} right.$
Ответ: 
$(1 frac{10}{11} ; frac{7}{11}),(1;2)$

Answer 2

Здравствуйте, помогите пожалуйста с алгеброй : 1) https://znanija.com/task/29240493 2) https://znanija.com/task/29240508 3) https://znanija.com/task/29240517