If y varies directly with x and y=15 when x=5, what is the value of k?

2 Answers
Apr 15, 2018

k=3

Explanation:

"the initial statement is "ypropx

"to convert to an equation multiply by k the constant"
"of variation"

rArry=kx

"to find k use the given condition"

y=15" when "x=5

y=kxrArrk=y/x=15/5=3

"the direct variation equation is "y=3x

Apr 15, 2018

The answer is 3.

Explanation:

y\propto x\implies y=kx

For the given values, 15=5k\implies k=\frac 15 5=3.