Ratio
The graph shows the relationship between inches and centimetres.
y
0 10 20 30 40 50 60 70 80 90
x
0 5 10 15 20
25 30 35 40
Inches
Use the graph to estimate (a) 15 inches =
(b) 50 centimetres =
centimetres
inches
E
Look at the graph on the opposite page. Talk to a partner to answer these questions: How would the graph change if the price of gas went up? How would the graph change if the price of gas went down? Will a graph showing the amount and price of gas always pass through 0?
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