Data from an experiment may result in a graph indicating exponential growth ... we can say that the equation of the straight line is \(y = mx + 6\). Now we need to find the gradient.

As the tangent is a straight line, the equation of the tangent will be of the form \(y = mx + c\). We can use perpendicular gradients to find the value of \(m\), then use the coordinates of P to ...