Question

se (X+y) = 13 e (x-y)=3 x elevado 2 y elevado 2 pfff

Answer 1

X + Y = 13
X - Y =  3

2x = 16

x = 16/2

x = 8

8 + y = 13

y = 13 - 8

y = 5

Logo x² = 8² = 64               e y² = 5² = 25