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The intercept (where the graph crosses the vertical axis) is the cost when there are zero guests. This is the charge for hiring the room and is equal to £350. Question Find the gradient of the graph.
The gradient shows the cost per litre. Petrol costs £1.15 per litre. The graph crosses the vertical axis at (0, 0). This is known as the intercept. It shows that if you buy 0 litres, it will cost ...