The problem gives an equation that represents the cost $c$ of hiring a caravan for $d$ days: $c = 40d + 100$. We need to plot this line on the given axes, where the x-axis represents the number of days $d$ and the y-axis represents the cost $c$ in pounds.

1. Problem Description

The problem gives an equation that represents the cost $c$ of hiring a caravan for $d$ days: $c = 40d + 100$. We need to plot this line on the given axes, where the x-axis represents the number of days $d$ and the y-axis represents the cost $c$ in pounds.

2. Solution Steps

To plot the line $c = 40d + 100$, we need to find at least two points that satisfy this equation.

Step 1: Find the y-intercept (when $d=0$).

$c = 40(0) + 100 = 100$. So, the point $(0, 100)$ is on the line.

Step 2: Find another point. Let's choose $d=5$.

$c = 40(5) + 100 = 200 + 100 = 300$. So, the point $(5, 300)$ is on the line.

Step 3: Plot the two points $(0, 100)$ and $(5, 300)$ on the graph.

Step 4: Draw a straight line through these two points. The line will represent the relationship between $c$ and $d$.

3. Final Answer

The solution involves plotting the line $c=40d+100$ on the given axes, passing through the points (0, 100) and (5, 300). Because I am text-based I cannot plot it. The answer involves providing the graph from the steps above.