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Two quantities, x and y, are directly proportional. If x is tripled, what happens to y? It is multiplied by 13. It is tripled. It is multiplied by 9. It depends on the starting value of x.

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Answer: It is tripled.

Since x and y are proportional, whatever happens to x must happen to y in order for the two values to stay proportional.

Answer:

Option B.

Step-by-step explanation:

It is given that two quantities, x and y, are directly proportional. It means

[tex]y\propto x[/tex]

[tex]y=kx[/tex]

where, k is constant of proportionality.

We need to find the effect on y if x is tripled.

Let [tex]x_1=3x[/tex], then

[tex]y_1=k(3x)[/tex]

[tex]y_1=3(kx)[/tex]

[tex]y_1=3y[/tex]

It means y is also tripled.

Therefore, the correct option is B.

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