If an equation can be rearranged into the form \(y = mx + c\), then its graph will be a straight line. In the above: \(x + y = 3\) can be rearranged as \(y = 3 - x\) (which can be re-written as ...

work out \(y\) when \(x = 0\): \(0^2 - 6 \times 0 + 9 = 9\) so the graph crosses the \(y\)-axis at \(y = 9\). Sketching a quadratic using the turning point and the line of symmetry - Higher The ...