Answer:
= -28
Step by step solved:
Let's assume that the second number is represented by the variable "x".
The sum of the first number (10) and the second number (x) is -18. We can represent this situation with the following equation:
10 + x = -18
To solve for "x", we can isolate the variable by subtracting 10 from both sides of the equation:
x = -18 - 10
Simplifying the right-hand side:
x = -28
Therefore, the second number is -28.