The value of y varies directly with x, and y=1 when x=2. What is y when x=4?

2 Answers
Apr 15, 2018

2

Explanation:

Here, y prop x
rArr y = kx where k is constant.
rArr 1 = k.2 [put y =1,x=2]
rArr k = 1/2

Again, y = kx
rArr y = 1/2×4[put x = 4]
rArr Y = 2

Apr 15, 2018

y=2

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=1" when "x=2

y=kxrArrk=y/x=1/2

"equation is " color(red)(bar(ul(|color(white)(2/2)color(black)(y=1/2x)color(white)(2/2)|)))

"when "x=4" then"

y=1/2xx4=2