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# How do you find the equation of perpendicular lines?

2 years ago

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1 Reply

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J

Jorge Ledner

1 Answer

Lissie
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Experienced Maths tutor, infectiously enthusiastic

First find the equation of one line using the information you have.

- You may need to use the formula for finding gradient, then find the intercept using a known point that the line passes through.

If your first line has equation y = mx + c then a line that is perpendicular will have a gradient equal to -1/m

You can find the intercept of the second line by plugging in any known value on that line.

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