Maths GCSE Straight line graphs. 4.0 / 5 MathematicsGraphsGCSEAll boards Created by: Alice PenningtonCreated on: 05-06-11 09:51 straight line graphs 1. Find two accurate points and complete the triangle 2. Find the change in x and the change in y 3. Use the formula ( GRADIENT = CHANGE IN Y / CHANGE IN X ) 4. Check the sign's right (If the line slopes uphill, then it's positive. If the line slopes downhill, then it's negative) 1 of 4 Parallel lines REMEMBER the equation of a straight line is y = mx + c where m is the gradient and c is the y intercept. Parallel lines have the same value of m (the same gradient) but have different intercepts E.g. y = 2x + 3, y = 2x and y = 2x - 4 2 of 4 Perpendicular lines The gradients of two perpendicular lines multiply to give -1 E.g. If the gradient of the first line is m, the gradient of the other line will be -1/m, beacuse m x -1/m = -1 3 of 4 Line and Line Segments A LINE is straight and CONTINUES TO INFINITY in both directions A LINE SEGMENT is just part of a line - it has TWO END POINTS 4 of 4

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