Question:
For all rational numbers $x$ and $y, x-y=y-x$.
Solution:
False.
Let $x=2, y=3$
Then.
LHS $=x-y$
$=2-3$
$=-1$
$\mathrm{RHS}=\mathrm{y}-\mathrm{x}$
$=3-2$
$=1$
By comparing LHS and RHS
$-1 \neq 1$
$\mathrm{LHS} \neq \mathrm{RHS}$
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