Question

The sum of negative eighteen and a number is eleven. What is the number?

Which equation could be used to solve the problem?

Answer 1

29

Explanation:

Your equation can be -18+x=11. Since we don't know the number, we can use x. We are trying to find out a number that when it's added to -18, the answer will be 11.

Now, we solve the equation:

-18+x=11

x=11+18

x=29. Answer

To check this answer:

we can use our equation and substitute 29 for x.

-18+x=11

-18+(29)=11

11=11.

They are equal. Therfore, the answer is correct.

Answer 2

-18 + x = 11

x = 29

Explanation:

To solve this, you can use the formula of a + b = c

`-18 + x = 11\\-18 = 18\\11 + 18 = 29\\x = 29`