Question

me ajudem por favor
a)x+y=11
x-y=3

Answer 1

x= 11-y

11-y-y= 3
11-2y= 3
-2y= 3-11
-2y= -8 . (-1)
y= 8/2
y= 4.

x= 11-y
x= 11-4
x= 7.