Question

Which line is perpendicular to y =
$\frac{x}{2}$
+1​

Answer 1

If $y=\frac{x}{2}+1$ then $y_{\perp}=-2x+1$.

The slope in first line is $1/2=0.5$, therefore the slope of perpendicular line must be $-1/0.5=-2$.

Hope this helps.