A slope of -3 is steeper.
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The slope of two lines are perpendicular only if their slopes multiplied together equal -1 (m1*m2 = -1). So if a line has a slope of -3 then a line perpendicular to this one has a slope of -1/-3 or 1/3.
Points: (-2, 3) and (1, 1) Slope: -2/3
Points: (-1, 2) and (3, 3) Slope: 2-3/-1-3 = 1/4
Points: (-1, 2) and (4, 3) Slope: 1/5
Points: (1, 2) and (3, 8) Slope: 3