Sistemas de equações? 1) (3 + X) (4 + Y) =20 2) X+Y=2?

Comments

• maria-descartes

  June 2021

  (1) (3 + X) (4 + Y) =20

  (2) X+Y=2? =>x=2-y

  (1)12+3y+4x+xy=20

  4x+3y+xy=8

  4(2-y)+3y+(2-y)y=8

  8-4y+3y+2y-y²-8=0

  -y²-y=0

  y²+y=0

  y(y+1)=0

  y'=0

  y"=-1

  Para y=0;

  x+y=2=>x=2

  Para y=-1;

  x=2+1=> x=3

  S={(2;0);(3;-1)}

  #
• felipemello80

  June 2021

  y 3+x3-3-1=2

  e 1+1=3