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www.varsitytutors.com/act_math-help/how-to-find-the-slope-of-a-perpendicular-line

Perpendicular lines have slopes that are the opposite of the reciprocal of each other. In this case, the slope of the first line is -2. The reciprocal of -2 is -1/2, so the ...

www.varsitytutors.com/algebra_1-help/how-to-find-the-slope-of-perpendicular-lines

The slope of the given line is –10/4. A perpendicular line will have a slope with the opposite reciprocal. In simpler terms, you flip the slope and change the sign, ...

www.mesacc.edu/~scotz47781/mat150/notes/eqn_line/Equation_Line_Parallel_Perpendicular_Notes.pdf

To find the slope of this line we need to get the line into slope-intercept form (y = mx + b), which means we need to solve for y: The slope of the line 4x – 5y = 12 is  ...

www.purplemath.com/modules/slope3.htm

Put this together with the sign change, and you get that the slope of a perpendicular line is the "negative reciprocal" of the slope of the original line — and two line...

www.mathsisfun.com/algebra/line-parallel-perpendicular.html

Parallel Lines. How do we know when two lines are parallel? Their slopes are the same! The slope is the ...

www.youtube.com/watch?v=ndPq7gbin7A

Nov 21, 2011 ... u13 l2 t3 we1 Perpendicular Line SlopeMore free lessons at: http://www. khanacademy.org/video?v=ndPq7gbin7A.

study.com/academy/lesson/perpendicular-slope-definition-examples.html

The slopes of two perpendicular lines are negative reciprocals of each other. This means that if a line is perpendicular to a line that has slope m, then the slope of ...

tutors.com/math-tutors/geometry-help/perpendicular-slope

A perpendicular slope is the negative reciprocal of any other slope. Reciprocals. Reciprocals are two values such that multiplying them gives a product of 1 ...

www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/perpendicular-lines

But also negative!!! Why? I don't use trigonometry but it's pretty simple. If a line goes up, positive slope, the perpendicular goes down, negative slope ...

www.khanacademy.org/math/geometry/hs-geo-analytic-geometry/hs-geo-parallel-perpendicular-eq/v/perpendicular-lines-2

This tells me that the slope of the perpendicular line is 1/2. The equation for my second line would then be, (6) = 1/2*(2) + b. Solving this gives me the y-intercept  ...