Answer:
The equation that represents this situation is 10 + x = -18. The second number is -28.
Step-by-step explanation:
The sum of two numbers is -18 and the first number is 10:
As an equation it would look like this:
10 + x = -18
To find the second number, we need to isolate it on one side of the equation, while keeping the expression true.
So first we subtract 10 from both sides:
10 -10 + x = -18 - 10
x = -28
Let's check!
10 + - 28 = -18
-18 = - 18
