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Line B is perpendicular to Line A if its slope is the negative reciprocal of the slope of Line A.

When a linear equation is in the form

y = mx + b,

m is the slope, and b is the y-intercept. So, for example,

y = (2/3)x + 5

is perpendicular to

y = (-3/2)x + 7.

(The y-intercepts in these two equations are random numbers.)

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9y ago
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9y ago

If the straight line equation was: y = 5x+7 then its perpendicular equation could be y = -1/5x+7

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Q: How do you write an equation that is perpendicular?
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