What value of x makes the equation true?
–8.6 = –4.1 + x
a.
–12.7
b.
–4.5
c.
4.5
d.
12.7

B. -4.5

You need to isolate x by subtracting -4.1 and to keep the equation equal you need to do this on both sides. 

The simple way would be to just try every single one, but I'm gonna tell you how to solve this stuff anyways. So basically, pretend x is a (blank). You've probably done this hundreds of times in school before. Now, you can simply just do -8.6 minus -4.1, and you get the answer -4.5. Make sense? That would mean that it's B.

Horizontal change or the change of x

Where's the rest of the