Question

x+y=78
x-y=16
me ajuda pfv

Answer 1

x+y=78

x-y=16

x+y=78

x=78-y

Substituindo x:

x-y=16

78-y-y=16

-2y=16-78

-2y= -62(-1)

y=62/2

y=31

Substituindo y

x+y=78

x+31=78

x=78-31

x=47