Answer :
The sum of 8 and y may be expressed as
8 + y
when 4 is added to the sum of 8 and y, the result
= 8 + y + 4
= 8 + 4 + y
= 12 + y
The sum of 8 and y may be expressed as
8 + y
when 4 is added to the sum of 8 and y, the result
= 8 + y + 4
= 8 + 4 + y
= 12 + y