Question

if x+y=5,andx=3,find y

Answer 1

3+y=5  (transpose 3)

y=5-3 (subtract 3 from 5)

so y=2

Answer 2

given that,
x+y=3;x=3;y=?
According to the problem,
x+y=5
3+y=5
y=5-3
Therefore y=2