The following table shows the weights of two types of cheddar cheese and their costs. Which type of cheese can be bought more for a less amount of money?
Type I
Weight (in lb)
1
2
Cost (in $
5
10
A
Both have the same cost per unit.
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B
Type I
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C
Both have the same cost per unit.
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D
Type II
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Solution
The correct option is B Type I Type I
Unit rate =102=51=$5/lb
Type II
The graphs are straight lines and pass through the origin.
Hence, the graph shows a proportional relationship. x1=0,y1=0;x2=10,y2=60
Unit rate RiseRun=y2−y1x2−x1=60−010−0=$6/lb 5<6
Thus, type I cheese can be bought more for a less amount of money.