Straight-line graphs and coordinate geometry

By the end you’ll be able to

• Plot and interpret straight-line graphs, and identify the gradient and $y$-intercept from $y = mx + c$ or after rearranging
• Find the equation of a line through two points, or through one point with a given gradient
• Use the gradient conditions for parallel lines ($m_1 = m_2$) and perpendicular lines ($m_1 m_2 = -1$) to find equations (Higher)