# What is the slope of any line perpendicular to the line passing through (30,39) and (18,10)?

${m}_{2} = - \frac{29}{12}$
${m}_{1} = \frac{{y}_{2} - {y}_{1}}{{x}_{2} - {x}_{1}}$
${m}_{1} = \frac{39 - 10}{30 - 18}$
${m}_{1} = \frac{29}{12}$
Therefore ${m}_{2} = - \frac{29}{12}$.