Question

Решение систем уравнений второй степени

Answer 1

$\ begin{cases}x-8y=-5x-5y\xy-y=40end{cases}\ begin{cases}6x-3y=0\y(x-1)=40end{cases}\ begin{cases}y=2x\y(x-1)=40end{cases}\ begin{cases}y=2x\2x(x-1)=40end{cases}\ begin{cases}y=2x\x^2-x-40=0end{cases}\ x_1=-4,y_1=-8\ x_2=5,y_2=10$$\ begin{cases}x-8y=-36\ x^2+4y-7xy=-104 end{cases}\ begin{cases}x=8y-36\ x^2+4y-7xy=-104 end{cases}\ begin{cases}x=8y-36\ left (8y-36 right )^2+4y-7left (8y-36 right )y+104=0 end{cases}\ begin{cases}x=8y-36\ 64y^2-16*36y+36^2+4y-56y^2+7*56y+104=0 end{cases}\ begin{cases}x=8y-36\ 8y^2-320y+1400=0 end{cases}\ begin{cases}x=8y-36\ y^2-40y+175=0 end{cases}\ y_1=5, x_1=4\ y_2=35, x_2=244$

Answer 2

неверно.

Answer 3

прошу прощение.Вы решили только одну фотку.