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?

A. 0.8 = 0.8
B. –0.8 = –0.8
C. 3 = 3
D. –3 = –3

Answer 1

1.4(-2)+2=2(-2)+3.2
-0.8=-0.8

Answer 2

we have

`1.4n + 2 = 2n + 3.2`

we know that

If
`n=-2` is a solution of the equation

then

the value of n must satisfied the equation

Substitute the value of n in the equation

`1.4*(-2) + 2 = 2*(-2) + 3.2`

`-2.8 + 2 = -4 + 3.2`

`-0.8 = -0.8` ----> the equation is true

so

The value of n is a solution of the equation

therefore

the answer is the option B

`-0.8 = -0.8`