Equation of a Straight Line (AQA A-Level Mathematics): Flashcards

$y = mx + c$

Slope of the line

$y$-intercept

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

$y - y_1 = m(x - x_1)$

$Ax + By + C = 0$

$y - y_1 = \frac{y_2 - y_1}{x_2 - x_1}(x - x_1)$

Point where line crosses $y$-axis (when $x = 0$)

When you know slope $m$ and one point $(x_1, y_1)$

Steepness of the line