Construct a straight-line graph using a linear function of the form, 𝑦 = 𝑚𝑥 + 𝑐 where 𝑚 is slope (gradient) and 𝑐 is 𝑦-intercept.

A heating engineer charges a call-out fee plus an hourly rate for each job. The table below shows the total cost for jobs of different durations. Construct a straight-line graph to display the relationship between job duration and total cost on the grid provided, showing: (a) the linear function in the form \(y = mx + c\) [2 marks] (b) the graph with appropriate scaling and labelling of axes [2 marks]