How to solve simultaneous equations I puzzlerajlogic I Algebra

how to solve simultaneous equations

Example:- x-y=1...i

x+y=5....ii

step 1- x-y=1....i

           x+y=5...ii

add both eq.

2x=6

x=6/2

x=3 

put x value in eq. i

3-y=1

-y=1-3

-y=-2

y=2

solve  below equations

x+y=4

x-y=2

find x and y , comment answer