Question

Describe and correct the error in finding the solution.
-4.2x=21
-4.2x/4.2=21/4.2 x=5

Answer 1

He used the commutative property incorrectly. a

Explanation:

Answer 2

The error is that the person divided both sides by positive 4.2 rather than negative 4.2. Here's how to correct it:

1. -4.2x ÷ -4.2 = x, 21 ÷ -4.2 = -5
2. So, x = -5.

I hope this helps!