Question

Nia solved the equation -1.98 = 5.2v + 13.1. Her answer was v = -2.9. She is fairly confident about her answer, but wants to do a quick check of her solution using estimation to make sure her answer is reasonable.

Which of the following shows a good check of her answer?
-2 = 5(-3) + 13
-3 = 5(-2) + 13
-1 = 5(-2) + 13
-2 = 5(-2) + 13

Answer 1

A. -2 = 5(-3) + 13

Explanation:

I got this answer correct hope this helps you out <3

Answer 2

She should check using estimating. Instead of -1.98 = 5.2v + 13.1

use the approximation -2 = 5v + 13, and let v = -3.

Then -2 = 5(-3) + 13.

-2 = -15 + 13

and so on.

Which of the given approx equations would make for the best check of the solution v = -2.9?