GCSE Maths (Edexcel)

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Calculating Equations of Straight Lines

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Algebra Graphs

Calculating Equations of Straight Lines

4:29 Straight Line Graphs
Spec A10
Previous Calculating Gradients Next Plotting Straight Line Graphs
  • The equation of a straight line is y = mx + c, where m is the gradient and c is the y-intercept.
  • The gradient can be found using the formula m = (y2 - y1) / (x2 - x1), where (x1, y1) and (x2, y2) are the coordinates of two points on the line.
  • To find the y-intercept, determine the point where the line crosses the y-axis.
  • Examples are given to practice finding the equation of a straight line.
  • The equation can be confirmed by substituting values and checking if they lie on the line.

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