Question

a+b=2
a-b=2
on solving one and 2
a+a+a+a=8
a=2
b=b-b
b=0
explain how is this right or not
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Answer 1

a + b = 2

a - b = 0

add both the equations

2a = 4

a = 2

substitute in any equation and get value of b

b = 0

Answer 2

the solution is right..

add the first 2 equations u get:-

$2a = 4 \\ a = 4 \div 2 = 2$

substituting the value of a in the first equation:-

$2 + b = 2 \\ b = 2 - 2 = 0$

therefore your answer is right..

hope this helps!!