Question

sendo, x= 5-1 e y= -9-1 determine o valor de.

x+y=
x-y=

Answer 1

x+y=5-1+ -9-1=14

x-y=5-1 -9-1=4

Answer 2

x+y
(5-1)+(-9-1)
4-10
-6
x-y
(5-1)-(-9-1)
4+10
14