Final answer:
The side length of the smaller square is 4 units, and the side length of the larger square is 14 units.
Step-by-step explanation:
The problem states that the difference in the side lengths of two squares is 10 and the sum of the side lengths is 18. Let's assume x represents the side length of the smaller square.
The side length of the larger square would then be x + 10.
Using the information given, we can set up the equation: x + (x + 10) = 18. Solving for x, we find that the side length of the smaller square is 4 units, and the side length of the larger square is 14 units.