Respuesta :

mozarth11
x+y = 15
x-y = 25
------------
2x = 40
x = 40/2
x = 20

y = 15-x
y = 15-20
y = -5

2x² - y² = 
2*20² - (-5)² =
2*400 - 25 = 
800 - 25 = 
775
rybag99
The answer is B as since x = 20 and y = -5