This document discusses which of four mathematical equations is always true. It examines each equation using an example where a=3 and b=5. Only equation 4, a+b=b+a, is true for all integers when a=3 and b=5. Equation 4 is the commutative property of addition, which states that the order of adding numbers does not change their sum. Therefore, equation 4 is always true, while equations 1, 2, and 3 are not always true.

1. ii dont understand thiis promble .... and the question says which equation is alwaysz true
1. a/b=b/a
2. a=2b=b+2a
3. a-b=b-a
4. a+b=b+a
Solution
think for example a=3 , b=5 1. 3/5 is not equal to 5/3 2. 3 is not equal to 10 3. -2 is not equal to 2
4. This is always true for all integers 3+5 = 5+3 1 is true only when a=b ( so 1 is not always!
true) simlilarly for 2, 3. If you need proof for this dont hesitate to message me here