Question

qual a solução do sistema: x+y=5 x-y^2=3

Answer 1

x+y=5
x= 5-y

x-y^2= 3
(5-y)-y^2= 3
5-y-y^2= 3
5-2y^2= 3
-2y^2= 3-5
-2y^2= -2 (-1)
y^2= 2/2
y^2= 1
y= raiz quadrada de 1
y= 1.

x= 5-y
x= 5-(1)
x= 4.