Please help! I want to understand how they got the answer. http://prnt.sc/aa48pl

Question

gabbyalicorn · Answer

I know the answer is -4 but it would be much appreciated if someone showed me the steps. :)

gabbyalicorn · Answer

@Directrix @jabez177 @mathmale @kropot72 @Michele_Laino @YoungStudier

gabbyalicorn · Answer

@KyanTheDoodle

kyanthedoodle · Answer

Yo I have no idea. So sorry about that.

gabbyalicorn · Answer

It's fine. Thanks for at least looking.

jabez177 · Answer

Linear functions are those whose graph is a straight line. A linear function has the following form. y = f(x) = a + bx. A linear function has one independent variable and one dependent variable. The independent variable is x and the dependent variable is y.

jabez177 · Answer

http://www.mathsisfun.com/algebra/linear-equations.html This site explains very nicely. :) Have a brief look at it. :)

gabbyalicorn · Answer

Okay, thank you. I'll take a look. :)