Question

responda esses sistemas

x+6y=3
x.y= -9

Answer 1

x=3-6y
xy=-9

(3-6y)y=-9
3y-6y²=-9
y-2y²=-3
y-2y²+3=0
-2y²+y+3=0
2y²-y-3=0
y=-(-1)+-√(-1)²-4.2.(-3)/2.2
y=1+-√1+24/4
y=1+-5/4
y=1+5/4
y=1-5/4
y=3/2
y=-1


x=3-6.3/2
x=3-6.(-1)

x=-6
x=9

(x1,y1)=(-6, 3/2)
(x2,y2)= (9, -1)

-6+6.3/2= 3
-6.3/2=-9


9+6.(-1)=3
9.(-1)=-9

3=3
-9=-9

3=3
-9=-9


(x1,y1)= (-6, 3/2)
(x2,y2)= (9, -1)