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If (-7, -8) is the coordinates of a point, and you mean a line that passes through that point, the slope can be anything. You need some additional information to determine the slope.
Points: (0, 7) and (8, -3) Slope: -5/4
let (x1, y1) = (4, 7) and ( x2, y2) = ( 7, -8). Then, Slope = m = (y2 - y1)/(x2 - x1) m = (-8 - 7)/(7 - 4) m = -15/3
Points: (-1, 8) and (5, -4) and the slope works out as -2
15
If the points are: (0, 3) and (8, -3) then the slope works out as -3/4