You can find the slope of a line by rearranging it in the format y = s(x + a) + b. In that case, "s" will be the slope:
3x - 6y = 15
6y = 3x - 15
2y = x - 5
y = x/2 - 2.5
So the slope in this case is 1/2.
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Equation of given line: 3x + y = 15 or y = -3x + 15 Slope of given line = coefficient of x = -3 Slope of perperndicular = -1/(slope of given line) = -1 / (-3) = 1/3
Points: (15, 8) and (7, 3) Slope: 5/8
Points: (-1, -1) and (3, 15) Slope: 4
Points: (0, 5) and (10, -15) Slope: -2
If you mean points of (1, 5) and (-1, -1) then the slope works out as 3