Revision (Grade 12 NSC Matric Mathematics): Quizzes

$AB = \sqrt{(x_2 - x_1)^2 + (y_2 - y_1)^2}$

How steep a line is and rate of change

$(5; 5)$

Gradient-point form: $y - y_1 = m(x - x_1)$

$y = k$ (where k is a constant)

Undefined

$m = \tan \theta$ for $0° \leq \theta < 180°$

Obtuse angle (90° < $\theta$ < 180°)

$m_1 = m_2$ (identical gradients)

$m_1 \times m_2 = -1$