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Straight line graphs. All straight line graphs have ... which matches the calculated gradient of –3. Next, to find the 𝑦-intercept, 𝑐, choose one of the given points, for example (1 ...

To work out the equation of a line from a graph, find the gradient and the \(y\)-intercept. The gradient is the same all along the line, so it doesn’t really matter where you start or finish ...