Question

The solution is n = –2 verified as a solution to the equation 1.4n + 2 = 2n + 3.2. What is the last line of the justification?

Answer 1

Answer: -0.8 = -0.8

Explanation:

On the 1st equation: 1.4n + 2, plug in -2 as n. So: 1.4(-2)+2 = -0.8

On the 2nd equation: 2n + 3.3, plug in n as -2. You have: 2(-2) + 3.2 = -0.8.

So, both equal -0.8.

Answer 2

Solve:
1.4n + 2 = 2n + 3.2

Group like terms and change its corresponding signs.
1.4n - 2n = 3.2 - 2

Simplify each term:
-0.6n = 1.2

Find n by dividing each side with -0.6
-0.6n/-0.6 = 1.2 / -0.6
n = -2

The last line of the justification is the division -0.6n and 1.2 by -0.6.