SOLUTION: What plus -1 equals -20

Algebra.Com
Question 1210350: What plus -1 equals -20
Found 2 solutions by AnlytcPhil, ikleyn:
Answer by AnlytcPhil(1807)   (Show Source): You can put this solution on YOUR website!

What plus -1 equals -20?

Let the answer be x:

x + (-1) = -20

Add (+1) to both sides of the equation):

x + (-1) + (+1) = -20 + (+1)
              x = -20 + 1
              x = -19

The answer is -19.

Edwin
Answer by ikleyn(52871)   (Show Source): You can put this solution on YOUR website!
.

Informally, when you add -1 to a number, you shift the number one unit to the left on the number line.

So, if your shifted number is -20 after adding -1, it means that your original number was -19.

Thus, -19 is your answer in this problem.



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