Question

equacao 2 grau
x+y=3
x²+y²=29

Answer 1

x²+y²=29
x-y=3
x=3+y

(3+y)(3+y)=9+3y+3y+y²
y²+6y+9+y²=29
2y²+6y+9-29=0
2y²+6y-20=0
-6+|-raiz 36+160/4
-6+|-raiz 196/4
-6+|-14/4
y=-8/4=-2

DESCOBRINDO "x"

x²+y²=29
x²-2²=29
x²+4=29
x²=29-4
x²=25
x=+|-5