Any to solve these, i would really appericiate it!

The equation for slope intercept form is: y = mx + b
Any equation where m = --2 is correct in your cause.

So, the only equation with a slope of --2 are:
y = --2 + 4
3y = --6x + 12
--3(y - 4) = 6x

Most of these have to be simplified in order to find the correct slope. Hope this helps!

It’s a because c makes no sense

It is a percent with money involved too divide and you should have your answer