Question

write an equation of the line that passes through the point (-6,4) with slope -2

Answer 1

Okay, formula time :)
Anytime you're given a point (a,b) and a slope m, and you're tasked to find the line that goes through the point (a,b) with the slope m, you can use this formula...
\[\huge \color{blue}y = \color{green}m(\color{red}x-a)+b\]

Answer 2

That gives you the equation in a jiffy :)