-10
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There is no slope nor intercept because there is no equation, simply an expression.
Slope = [(-2) - 3]/(7 - 4) = -5/3
10
Slope of the given line is 3/7 So slope of perpendicular line is -7/3
Points: (-3, -1) and (-7, -8) Slope: (-1--8)/(-3--7) = 7/4 or 1.75