Why is my answer incorrect or why it must be equality symbol that is coming in?
"If $9>10$ then $3^2=5$" is the same as "$9\le 10$ or $3^2=5$".
If you say "$9$ is not greater than $10$", it means $9$ is either less than $10$ or it is equal to $10$, therefore $\sim(9>10)$ is the same as $9\not >10$ which is the same as $9\le 10$.
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"If $9>10$ then $3^2=5$" is the same as "$9\le 10$ or $3^2=5$".
If you say "$9$ is not greater than $10$", it means $9$ is either less than $10$ or it is equal to $10$, therefore $\sim(9>10)$ is the same as $9\not >10$ which is the same as $9\le 10$.