Question

If the value of y varies directly with x and y=9/5 when x = 1/3, find y when x is 10.

Answer 1

Y = 54

Explanation:

y α x

When changing α to =, a constant 'k' is introduced i.e

y = kx ----

y = 9/5 when x = 1/3

i.e 9/5 = k * (1/3)

k = (9/5) ÷ (1/3)

k = 9/5 * 3/1

k = 27/5

Therefore when x = 10

we substitute our values of k and x into the equation "y = kx"

i.e y = (27/5) * 10

y = 54 when x = 10