A marine engineer is testing a heavy-duty coil spring designed for dock mooring systems. They measure the horizontal extension of the spring under various tensile forces (loads) using a hydraulic test rig. The experimental setup is shown in Figure 1.
The engineer's measurements are recorded in the table below:
| Load LLL (kN) | Extension xxx (cm) |
|---|---|
| 3.0 | 1.2 |
| 6.0 | 2.4 |
| 9.0 | 3.6 |
| 12.0 | 4.8 |
| 15.0 | 6.0 |
| 18.0 | 7.2 |
Using a grid where the horizontal axis represents Load LLL (kN) from 0 to 20.0 and the vertical axis represents Extension xxx (cm) from 0 to 8.0, plot the points and draw a line of best fit.