Question

Points (1,1) and (2,4) lie on line k. what is the slope of the line that is perpendicular to k?

Answer 1

the equation for slope is ( y_{1} [/tex] --$y_{2}$) over ($x_{1}$ --$x_{2}$)

so for these two points, your equation would be $\frac{1- 4}{1- 2}$

which equals 3.

now any two lines that are perpendicular have the exact same slope by definition, so any line perpendicular to the line you just solved for will have a slope of positive 3.