A perpendicular lines slope is always the negative or opposite reciprocal of a lines slope. Therefore, if your slope is -13/1 then the perpendicularity of the other line is 1/13. The 13 would change positive there fore its its already a negative number then change it posiive.
For 13/24 and 7/15 the common denominator is 120. So we have: (13 x 5)/(24 x 5) and (7 x 8)/(15 x 8) 65/120 and 56/120 (which are equivalent respectively to 13/24 and 7/15). Since 65/120 > 56/120, so is 13/24 > 7/15.
0 A line with the equation y = -13 is a horizontal line. The slope is zero. If you think of the "y = mx + b" form of a straight line, the 'b' must be -13, and the 'm' must be zero since there is no x term. 'm' is the slope, so the slope is 0.
"pitch" can be measured in degree or percent drop. So, if you drop 6' vertically over 24', you would the pitch, or slope, would be 25%. Expressed in degrees, given that 90 degrees is vertical, it would be 25% of 90, or 22.5 degrees of slope.
you get slope when you take 2 points from a graph and divide y2 - y1 by x2 - x1. example: Compute the slope of the line between graph points (13,4) and (6,9). y2 - y1 = 9 - 4 = 5, x2 - x1 = 6 - 13 = -7, so the slope is 5/-7 (five over negative seven)