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

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

$-0.8 = -0.8$

Answer 2

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