What operator is used to check if x is less than or equal to y?

The operator used to check if one value is less than or equal to another value is the "less than or equal to" operator, which is represented as <=. This operator evaluates to true if the value on the left side is either less than or equal to the value on the right side. For example, if x is 5 and y is 10, the expression x <= y would evaluate to true. If x were equal to y, the expression would still evaluate to true, as equality is included in the condition.

The other operators serve different purposes. The equality operator (==) checks if two values are exactly equal, while the inequality operator (!=) checks if two values are not equal. The greater than operator (>) checks if the left value is greater than the right value. Therefore, using <= is the correct choice when specifically determining if one value is less than or equal to another.