# Formulaire:mathématiques - Géométrie - Ligne droite ⁄

## Ligne droite ⁄

### Définitions:

• x1: x1-coordonner
• x2: x2-coordonner
• y1: y1-coordonner
• y2: y2-coordonner
• m: Pente
• b: y-intercepter
• f:
• y: équation

#### Pente

$$m = \frac{y_2 - y_1}{x_2 - x_1}$$
m = Pente
y2 = y2-coordonner
y1 = y1-coordonner
x2 = x2-coordonner
x1 = x1-coordonner

#### Principale forme

$$y = m \times x + b$$
y = équation
m = Pente
b = y-intercepter

$$y = \frac{y_2 - y_1}{x_2 - x_1} \times x + \left( y_2 - \frac{y_2 - y_1}{x_2 - x_1} \times x_2 \right)$$
y = équation
y1 = y1-coordonner
y2 = y2-coordonner
x1 = x1-coordonner
x2 = x2-coordonner
y2 = y2-coordonner
y1 = y1-coordonner
y2 = y2-coordonner
x1 = x1-coordonner
x2 = x2-coordonner
x2 = x2-coordonner

$$y = m \times x + \left( y_2 - m \times x_2 \right)$$
y = équation
m = Pente
y2 = y2-coordonner
m = Pente
x2 = x2-coordonner

$$y = m \times x + \left( y_1 - m \times x_1 \right)$$
y = équation
m = Pente
y1 = y1-coordonner
m = Pente
x1 = x1-coordonner

#### Deux points formulaire

$$y - y_1 = \frac{y_2 - y_1}{x_2 - x_1} \times \left( x - x_1 \right)$$
f =
y1 = y1-coordonner
y1 = y1-coordonner
y2 = y2-coordonner
x1 = x1-coordonner
x2 = x2-coordonner
x1 = x1-coordonner