Question

Maria solved the equation -5 n = -9 . Her answer was n = 1 . She is fairly confident about her answer, but wants to do a quick check of her solution using estimation.
Which of the following shows a good check of her answer?

-6(2) = -12
-5(-2) = -10
-5(2) = -9
-5(2) = -10

Answer 1

I think it's answer C. -5(2) = -9

Answer 2

 -6(2) = -12
-5(-2) = -10
-5(2) = -9
-5(2) = -10