SOLUTION: y varies directly with x. so if: if x is doubled, what happens to y? what if x is halved?

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Question 96867This question is from textbook
: y varies directly with x. so if:
if x is doubled, what happens to y? what if x is halved?
This question is from textbook

Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
y varies directly with x.
y = kx
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if x is doubled, what happens to y
y = k(2x)
y = 2kx
"y" is doubled
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what if x is halved?
y = k((1/2)x)
y = (1/2)kx
"y" is halved
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Cheers,
Stan H.