A graph is a visual representation of the relationship between two quantities.If the graph is a straight line, the relationship is linear and the equation relating the quantities is of the form \(y = Ax + B\) where \(A\) is the gradient and \(B\) is the intercept on the \(y\)-axis.If the relationship is quadratic (of the form \(y =Ax^2 + Bx +C\)) the graph is a parabola. A parabola is a curve with increasing gradient. The effect...