If you are trying to find the slope of a line that is perpendicular to another line, you would need to change the sign and change it to the fraction's reciprocal.
m = [tex]-\frac{1}{3}[/tex]
Change the sign of the slope:
[tex]\frac{1}{3}[/tex]
Finally, make the reciprocal of the original slope (switching the numerator and denominator):
[tex]\frac{3}{1}[/tex]
Simplify:
3
Final answer:
[tex]m=3[/tex]