## Intermediate Algebra for College Students (7th Edition)

$\dfrac{1}{2}$; $-2$
RECALL: (i) The linear equation $y=mx+b$ has $m$=the slope and $b$=the y-intercept. (ii) Perpendicular lines have opposite reciporcal slopes. The given equation has $m=\frac{1}{2}$, so the slope of the line is $\frac{1}{2}$. The slope of a line that is perpendicular to this line has a slope of the opposite reciprocal of 1/2. which is $-2$.