Question

Помогите пожалуйста!!!!​

Answer 1

a) x=3y => x^2-y^2=(3y)^2-y^2

9y^2-y^2=32

8y^2=32

y^2=4

y1=-2   y2=2

x1=-2*3=-6     x2=2*3=6

b)2x+y=-12=> y=-12-2x

x^2+y^2-2xy=(x-y)^2

(x-y)^2=3^2=> x-y=+-3

x-(-12-2x)=+-3

3x+12=+-3

x1=-3     x2=-5

y=-12-2x=>

y1=-12-2(-3)=-6    y2=-12-2(-5)=-2