To describe the positioning of the numbers -4.3 and -7.9 on a number line:
-4.3 would be to the right on the number line.
-7.9 would be to the left on the number line.
-4.3 is greater than -7.9 on the number line.
This is because, on a number line, numbers increase as you move from left to right, and since -4.3 is less negative than -7.9, it is to the right.