Edexcel ·Mathematics·Cambridge IGCSE Mathematics

Coordinate Geometry & Straight-Line Graphs

13 min read

Gradient, the equation y = mx + c, midpoint and length of a line, and parallel and perpendicular lines.

Gradient and the equation of a line

The gradient of a line through $(x_1, y_1)$ and $(x_2, y_2)$ is

$m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{\text{rise}}{\text{run}}$

The straight-line equation is $y = mx + c$ , where $m$ is the gradient and $c$ is the $y$ -intercept.

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Edexcel ·Mathematics·Cambridge IGCSE Mathematics

13 min read

Gradient, the equation y = mx + c, midpoint and length of a line, and parallel and perpendicular lines.

The gradient of a line through $(x_1, y_1)$ and $(x_2, y_2)$ is

$m = \frac{y_2 - y_1}{x_2 - x_1} = \frac{\text{rise}}{\text{run}}$

The straight-line equation is $y = mx + c$ , where $m$ is the gradient and $c$ is the $y$ -intercept.

Create a free account to read this note in full. Every free account gets 2 complete revision notes — no card needed.