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www.mathplanet.com/education/algebra-1/formulating-linear-equations/parallel-and-perpendicular-lines

If two non-vertical lines in the same plane intersect at a right angle then they are said to be perpendicular. Horizontal and vertical lines are perpendicular to each  ...

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

No, they can have different y-intercepts. To be perpendicular, they only need to have opposite reciprocal slope. For example, the lines, y=3x+8 and y= -(1/ ...

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

Find the equation of the line that is: parallel to y = 2x + 1; and passes though the point (5,4). The slope of y=2x+1 is: 2. The parallel line needs to have the same ...

www.varsitytutors.com/algebra_1-help/how-to-find-the-equation-of-a-perpendicular-line

Perpendicular lines have slopes that are negative inverses of each other. Since the original equation has a slope of \displaystyle \frac{1}{2}, the perpendicular line ...

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

First, put the equation of the line given into slope-intercept form by solving for y. You get y = -2x +5, so the slope is –2. Perpendicular lines have opposite- reciprocal .....

www.youtube.com/watch?v=guf2gp6XqY4

Aug 21, 2014 ... Perpendicular lines have slopes which are negative reciprocals of each other, but why?

www.coolmath.com/algebra/08-lines/14-perpendicular-lines-01

Perpendicular Lines 1 - Cool Math has free online cool math lessons, cool math games and fun math activities. Really clear math lessons (pre-algebra, algebra, ...

www.ixl.com/math/algebra-1/slopes-of-parallel-and-perpendicular-lines

Improve your math knowledge with free questions in "Slopes of parallel and perpendicular lines" and thousands of other math skills.

www.purplemath.com/modules/strtlneq3.htm

This line has some slope value (though not a value of "2", of course, because this line equation isn't solved for "y="). I'll first need to find the sl...

courses.lumenlearning.com/waymakercollegealgebra/chapter/parallel-and-perpendicular-lines

Lines that are perpendicular intersect to form a 90∘ 90 ∘ angle. The slope of one line is the negative reciprocal of the other. We can show that two lines are ...