Equation of a Line Perpendicular to y= 1/2x-3 Through the Point (-4,0)

I find the equation of a line that is Perpendicular to y=1/2x-3 and crosses through the point (-4,0). I explain the meaning of Perpendicular and how that relates to the slope of a line. I use Point-Slope to solve for slope intercept form y=mx+b.