Question

if a=-5 by 11 and 9 by 11 verify a+b=b+a​

Answer 1

Answer:

a = 5/11

b = 9/11

a+b = 5/11 + 9/11

= 14/11

b+a = 9/11 + 5/11

= 14/11

Therefore a+b = b+a

Answer 2

Answer:

a= -5/11

b=9/11

now

(-5/11 + 9/11) = (9/11 +-5/11)

(a+b)=(b+a)

then

4/11 = 4/11

proved....