Answer
$y$ will decrease two times
Work Step by Step
If $y$ varies directly to $x$ ($y=kx$) and $x$ is halved, then $y$ will decrease two times.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.