Parallel & Perpendicular Graph Lines

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4 Terms

1
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parallel lines

same gradient, different y-intercept

  • y= 2x + 3, y= 2x + 1


2
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perpendicular lines

gradient is the negative reciprocal

  • y = 4x, y = -¼x


3
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finding gradient between 2 points

y2 - y1 / x2 - x1

  • greater number is usually x2/y2


4
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finding equation for Line2 if given equation for Line1 and a point of intersection (perpendicular)

  1. sub “m” with negative reciprocal

  2. sub x and y in the equation to find + c


<ol><li><p>sub “m” with negative reciprocal</p></li><li><p>sub x and y in the equation to find + c</p></li></ol><p></p>