Alright, lets get started.
Suppose the age of Alysha = x
As given in question, Alysha is 2 years younger than Bryce.
So age of Bryce will be = 
As per given in question the sum of their ages is 28, so


Subtracting 2 fom both sides


Dividing 2 in both sides
x = 13
Means age of Alysha will be = 13
Means age of Bryce will be = 
Alysha and Bryce ages are 13 and 15 years respectively. : Answer
Hope it will help :)