Answer
$-4$
Work Step by Step
We use the equation for slope:
$m = \frac{y_2-y_1}{x_2-x_1}$
$m_1 = \frac{3-1}{11-3}=\frac{1}{4}$
The opposite reciprocal of this is -4, so this is the slope of the perpendicular bisector.
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