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The table shows the relationship between the number of cups of cereal and the number of cups of raisins in a cereal bar recipe:


Number of cups
of cereal Number of cups of
raisins
8 2
12 3
16 4


Molly plotted an equivalent ratio as shown on the grid below:

A graph is shown. The title of the graph is Cereal Bars. The horizontal axis label is Cereal in cups. The x-axis values are 0, 20, 40, 60, 80,100. The vertical axis label is Raisins in cups. The y-axis values are 0, 10, 20, 30, 40, 50. A point is plotted on the ordered pair 40,20.

Which of these explains why the point Molly plotted is incorrect?

(A) If the number of cups of cereal is 40, then the number of cups of raisins will be10.

(B)If the number of cups of raisins is 40, then the number of cups of cereal will be10.

(C) If the number of cups of cereal is 40, then the number of cups of raisins will be 80.

(D) If the number of cups of raisins is 40, then the number of cups of cereal will be 80.

Respuesta :

JeanaShupp

Answer: (A) If the number of cups of cereal is 40, then the number of cups of raisins will be 10.

Step-by-step explanation:

From the given table , we can check the given quantities are in proportion .

Since , [tex]\frac{x}{y}=\frac{8}{2}=\frac{12}{3}=\frac{16}{4}=4\\\Rightarrow\ x=4y[/tex]

So this case is of direct proportion, where the number of cereal cups is 4 times the cups of raisins.

It is said that A point is plotted on the ordered pair 40,20.

But [tex]\frac{40}{20}=2\neq4[/tex]

Hence, Molly is incorrect.

Since , [tex]x=4y\\\Rightarrow\ y=\frac{x}{4}=\frac{40}{4}=10[/tex]

Because, if the number of cereals is 40, then the number of raisins should  be 10 such that,

[tex]\frac{40}{10}=4[/tex]

Answer:

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Step-by-step explanation: