Question

-ab para a = 8yb = - 4 .

Answer 1

a=8yb

8yb= -4
b= -4/8y

=> -ab
=> - (8yb)(-4/8y)
=> -(-4b)
=> 4b

Hallamos 4b :
-4 /8y *4
-4/2y
-2/y

Espero te sirva !! ^^