Answer :
The correct equation that represents the situation where the sum of two numbers is -18 and the first number is 10 is:
B. 10 + x = -18
To find the second number, you need to solve the equation for x:
10 + x = -18
Subtract 10 from both sides:
x = -18 - 10
x = -28
Therefore, the second number is -28.