Question

A student is asked to solve the equation below and to justify her/his steps. Identify what, if anything, is incorrect in her/his math or justification.

x + 4 = –8

Equation Image - http://imgur.com/ZLkzP8S


A.
The student mislabeled the work in the step 2 as "Addition property of equality."
B.
The student improperly applied the "Addition property of equality" in step 2.
C.
The student added improperly and got the wrong answer in step 3.

D.
There is no error. The student's justification is correct.

Answer 1

@Astrophysics

Answer 2

What is -8 -4 =? :P

Answer 3

4?

Answer 4

Nope -8-4 = -12 we can think of doing this on a number line, this is very important so I'll show you what I mean.



So you see this number line, you have -8 and you want to -4 from it (fyi -8 + -4 => -8-4)
so jump 4 paces to the left.