Question

x varies directly as 3 y, x=8 when y=3, find x when y=27​

Answer 1

Answer:

When y varies directly with x, you can say that . The k stands for a mathematical constant. When you plug in the fact

Answer 2

Answer:

x ∝ 3y

or x = 3ky

or  y = x / (3k)

put x = 8 when y=3

3 =  8 /(3k) => k = 8/9

the equation becomes

y = 3/8 x

for find x when y=27

27 = (3/8) x

x =  72 ans