Question

The sum of 9 and a number is less than 12. Which of the following

inequalities expresses the solution?

Answer 1

9+x<12

Explanation:

add 9 to an unknown number.

9+x

use the < less than symbol (instead of an equal sign) and write 12.

Answer 2

x + 9 < 12

Explanation:

Let the unknown number = x

Sum of 9 and x : x + 9

x + 9 < 12