Question

Two quantities, x and y, are directly proportional. If x is doubled, what happens to y?

Answer 1

Answer:

y is also doubled.

Step-by-step explanation:

Direct proportionality between $x$ and $y$ means that

$y \propto x$

or

$y=cx$,

which indicates a linear relationship between  $x$ and $y$ because they are related by a constant.

Therefore, if x is doubled, then the new value of $y$ is $y_{new}$

$y_{new}=c(2x)$

$y_{new}=2(cx)$

$y_{new}=2y$

The new value of $y$ is 2 times the previous; therefore, $y$ is doubled as $x$ is doubled.

Answer 2

Answer:

It is doubled.

Step-by-step explanation:

Two quantities, x and y, are directly proportional. If x is doubled, what happens to y?

It is doubled.

I got it correct I took a screen shot I got it right.