A number n plus 7 is less than or equal to 9

We need to change the English writing into an inequality.

We know that a number "n" added to 7 is less than or equal to 9.

This can be written as follows:

n + 7 ≤ 9

Now, we will isolate the "n" at one side of the inequality. We will do this by subtracting 7 from both side as follows:

n + 7 - 7 ≤ 9 - 7

n ≤ 2